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Please talk to me like I'm stupid. :) I am hoping for a completely lay explanation. In particular, I'd like to understand in what situations I'd use a telephoto lens, and in what (other) situations I'd use a zoom lens.

Edmund Optics offers various fiber-coupled diode lasers, including visible and infrared emitters with high brightness fiber output, frequency-stabilized laser diodes, class IV high-power devices, Coherent® Diamond FLQ-Series fiber lasers and Coherent®high performance OBIS™ LX/LS fiber-pigtailed laser systems.

Edmund Optics offers various kinds of gas lasers, e.g. helium–neon lasers from Lumentum with up to 22.5 mW output power and improved stability, used in interferometers and metrology, and Coherent Diamond C-Series CO2 lasers.

Why bother with specific telephoto lenses? Because as opposed to generic zoom lenses with wide and long reach, they will have fewer image defects in their core range and will usually be considerably faster in that range. Their default long reach without too much detrimental optical trickery will also render the telephoto lenses the longest lenses to lug around, and being fast comes at the cost of a large entrance pupil and large front lens diameter. They are usually the largest and heaviest of all lenses. If you have an f=300mm lens with an aperture of f:1.4, its entrance pupil has a diameter of 214mm, and if it is not to suffer from significant vignetting, its front lens should be larger than that. Of course, you don't get them quite that fast. But there is little point in making them into a zoom lens also good at wide angle when a separate fast wide angle lens with good quality will add less weight and cost into your gear box.

Beam shutters are used to control the level of light exposure to an optical lens or lens system in a range of applications such as imaging or microscopy. Shutters are manually or motor controlled irises that may be opened or closed to control the level of light that passes through the aperture. Shutters provide an accurate, stable level of light transmission that may be easily adjusted or maintained for repeated implementation. A number of motorized shutters are also available that include several iris control modes for increased versatility.

Edmund Optics offers a wide range of analog and digital cameras designed for a variety of imaging applications, including video microscopy or industrial use. Cameras use a wide range of video outputs to display an image on a monitor. Digital cameras are available with a variety of digital interfaces, such as USB 2.0, USB 3.0, FireWire.a, FireWire.b, Gigabit Ethernet, or Camera Link® to ensure maximum compatibility with any number of applications’ needs. A selection of camera accessories is also available including mounting adapters, capture cards, or cables.

Edmund Optics has a variety of beam expanders, including devices for different wavelength regions (e.g. Nd:YAG and CO2), rotating or non-rotating optics for divergence adjustment and research-grade devices.

Nonlinear crystals with 20-10 surface quality and λ/10 (LBO) or λ/8 (BBO) surface flatness provide the broad transparency range and large nonlinear coefficient needed for the harmonic generation of fundamental laser frequencies. Each crystal features a protective anti-reflection (AR) coating that minimizes reflection and limits fogging from ambient conditions.

The maximum extension for this camera is 315mm. You can't move the front of the camera more than that distance out. But what if you want to use a longer lens? The Schneider 400mm f/5.6 Apo-Tele-Xenar (that's a mouthful - the 'apo' means it is an apochromat lens and then there's that 'tele' there...) has a focal length of 400mm... but its flange focal distance is 285.1mm. It could fit on that camera (well, in theory - it also has a #3 shutter and that lens board can only fit #1 and #0 shutters... but other than that).

Unless you are dealing with a large format system and looking at the rail on your camera, you aren't going to care about how the lens is designed and if the actual focal length is the distance between the lens and the focal plane or not. You've got a lens, you use it.

Edmund Optics is a premier supplier of UV optics including mirrors, lenses, filters, and beam expanders. We work with ISO 9001 certified and MIL-spec quality systems, and use a wide range of metrology including interferometers, cavity ring-down (CRD) spectrometers, Shack–Hartmann wavefront sensors, profilometers, and coordinate measurement machines (CMMs). We provided guaranteed laser damage threshold specifications.

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Edmund Optics offers various aspheric lenses, including CNC polished lenses, infrared lenses with diffraction-limited performance, precision glass molded lenses, color-corrected lenses, condenser lenses and plastic molded lenses.

So, instead of making a lens that has a focal length that is longer than the distance it is at, you make a lens that has a focal length that is shorter than the distance it is focused at. Retrofocus lenses often have big front elements.

Laser power and energy meters are available from Edmund Optics in a wide selection of wavelength ranges for customization over a large number of laser measurement needs.

The term "telephoto lens" has a particular technical meaning in terms of lens design, but in common usage it refers to a lens with a long focal length.

Technically 'Telephoto' means that the focal length [the mm] is longer than the lens is. In my experience, people in the photography world usually don't talk about it under that definition.

Edmund Optics offers superpolished laser window substrates where both surfaces have <1 Å r.m.s. surface roughness. The low scatter surfaces are ideal for UV and high power laser applications. We use UV fused-silica substrates with polished bevels and edges. Our in-house manufacturing enables custom versions with dimensions from 6 mm to 76.2 mm and different shapes; the surface roughness can be even <0.5 Å.

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A telephoto lens is optimized for long reach (good magnification at long distances). A zoom lens is one with variable focal length, usually ranging from wide to long. While a telephoto lens may have either fixed reach or variable reach, its focusing distance will contain ∞ and will usually start at a distance of more than a few meters (macro lenses also have good magnification but focus on near distances).

Our general purpose integrating sphere systems are designed to spatially integrate radiant flux in order to measure optical radiation. They can be coupled with a sensor to create radiometers, photometers, or spectroradiometers in order to measure the total geometric flux emanating from a light source or the flux density of an illuminated area. Additionally, these sphere systems can be used to measure the output of high power lasers and laser diodes or to measure the reflectance and transmittance of materials.

Edmund Optics offers a wide variety of microscopy components including microscope objectives, inverted and stereo microscopes, or optical filters that are ideal for use in microscopy setups. Microscope objectives are available in a range of magnifications and include infinity corrected, finite conjugate, and reflective objectives in industry leading brands such as Mitutoyo or Olympus. Microscope objectives are ideal for a range of research, industrial, life science, or general lab applications. Microscopy filters are ideal for isolating specific wavelengths in fluorescence imaging applications.

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Edmund Optics offers various kinds of mirrors for ultrafast laser technology, including highly dispersive chirped mirrors for different spectral regions such as 0.8 μm, 1 μm and 2 μm, but also UV and other infrared versions.

A zoom lens means the lens can change focal length via zooming, i.e. it is not a prime lens. A telephoto lens has a long focal length (I do not know if there is an official threshold to call a lens telephoto, but Nikon seems to start it at 85mm.

What is the difference between the two? Why would I want one over the other? I wiki'd telephoto lens but remain confused about this distinction.

Telephoto lenses can be either zoom or prime. Zoom means that they can change how far they are looking at or prime means they have a fixed amount of magnification and can't be altered. (Like an old instant camera with no zoom, but with much better picture quality.) The reason for using a prime is that they are a) cheaper and b) produce much, much higher quality images for the price.

The first lens is called the objective lens, and has typical magnification values from 5× to 100×. In standard microscopes, the objectives are mounted such that ...

Edmund Optics offers a wide selection of laser safety products including personal safety equipment and lab safety components. Laser safety eyewear provides CE certified laser radiation protection at wavelengths of common industrial lasers, including Nd:YAG and CO2, with various style and frame options for user comfort. Acrylic laser windows, also referred to as laser viewing windows, provide high visible light transmission and high optical densities at specified design wavelengths, allowing for the safe observance of lasers applications. Lab laser safety components, including laser warning signs and beam traps, are also available.

So, if you want the sharpest images possible, you are looking at using a prime (not a zoom) lens. If it is longer than 85mm or so, it is likely a telephoto lens of some design. Glance at Canon's Forgotten 400 which shows a comparison between a 400mm f/5.6 telephoto prime and a 100-400mm f/3.5-5.6 zoom lens.... though do realize that with real life one typically isn't looking at brick walls at the edge of the frame.

Edmund Optics offers a wide range of measuring tools suited for many optical measurement needs. Measuring gauges offer precise, easy-to-use measurement capabilities in a range of different sizes or types including calipers or micrometers. Spherometers are extremely specialized measurement tools that determine the surface radii of convex or concave objects. Standards tables are also included for quickly referencing radii information.

Edmund Optics offers a range of laser mirrors for use from the extreme ultraviolet (EUV) to the far IR. Laser mirrors designed for dye, diode, Nd:YAG, Nd:YLF, Yb:YAG, Ti:sapphire, fiber, and many more laser sources are available as flat mirrors, right angle mirrors, concave mirrors, and other specialty shapes. Ultrafast laser line mirrors designed to provide high reflection with minimal group delay dispersion (GDD) for femtosecond pulsed lasers including Er:glass, Ti:sapphire, and Yb:doped laser sources are also available.

Optical grade fiber plastic optics are designed to provide higher transmission in the visible region of the spectrum. They can be used for a wide range of applications, from general industrial light guides to short-distance data transmission. The fiber is tough and flexible but is not designed to bear loads.

Edmund Optics offers a wide range of dichroic, crystalline, and wire grid polarizers which can also be used for polarization beam combining.

Make it simple: zoom is a lens of multiple focal lengths of all focal ranges; telephoto is a prime from 85mm-300mm range and super telephoto is over 300mm+. (Info from Greengo).

Edmund Optics offers a wide variety of laser optics, including laser lenses, laser mirrors, laser filters, along with a variety of other components designed for laser use. Laser lenses are designed to focus, homogenize, or shape laser beams. Laser mirrors are ideal for beam steering applications. Laser filters transmit or reflect a portion of the laser light. Laser windows are used to transmit designated wavelengths or protect sensitive components or work areas from stray light.

Edmund Optics offers different kinds of green lasers, including argon-ion lasers, diode lasers and diode-pumped solid-state lasers.

Edmund Optics offers a wide range of industrial and pointing lasers, including visible laser diode modules, DPSS pointing lasers, red and IR alignment laser diodes, violet alignment diodes, compact LDM focusable laser diode modules and others.

An 18-200mm lens is a strange beast. It is a zoom lens but it can be considered both a wide angle (at 18mm) and a telephoto lens (at 200mm) because it's zoom range is so huge. You could shoot at 200mm and it's telephoto or you could shoot at 18mm and it's wide angle. In my experience if it is capable of telephoto, then you call it a telephoto. You'd then call it a telephoto zoom

Coherent® Diamond C-Series CO2 lasers offer reliability with more than 50,000 operating hours, along with superior beam quality and stability. These lasers are ideal for a wide range of applications from marking and engraving to material processing. They are a compact option with an integrated RF power supply. Maximum output power ranges from 20 to 40 watts, and can be controlled through pulse width modulation (PWM).

Edmund Optics provides a breadth of ultrafast optics, including low GDD ultrafast mirrors, highly dispersive ultrafast mirrors, compression prisms, reflective objectives and beam expanders, and nonlinear crystals. These products are designed for common femtosecond lasers, including Ti:sapphire, Yb:doped fiber, thulium (Tm), and holmium (Ho).

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Edmund Optics offers different kinds of cold mirrors, including versions with 0° and 45° angle of incidence and high performance versions with multi-layer dielectric coatings.

Edmund Optics offers a wide range of diode laser sources, including machine vision lasers, life science lasers, metrology lasers, industrial and point lasers, and material processing lasers.

Edmund Optics offers laser beam shaping solutions to collimate laser beams, transform beam profiles, convert beam shapes, and much more. Flat top beam shapers, used to convert Gaussian beams into flat top beams with a uniform intensity distribution, are available optimized for laser wavelengths associated with Nd:YAG, fiber, and CO2 lasers. Cylinder Lenses, offered in broadband and laser line versions, are ideal for laser machining or medical applications, which require laser light shaping in only one axis. Slow axis collimators and fast axis collimators are also available, which are ideal for collimated laser bars and laser diodes, respectively.

Edmund Optics offers plate, cube, pellicle, polka dot, and specialty prism beamsplitters in a variety of anti-reflection coatings or substrates. Standard beamsplitters, which split incident light by a specified ratio that is independent of wavelength or polarization state, are ideal for illumination subassemblies or as one way mirrors. Dichroic beamsplitters, which split light by wavelength, are often used as laser beam combiners or as broadband hot or cold mirrors. Non-polarizing beamsplitters, ideal for laser beam manipulation, split light by overall intensity. Polarizing beamsplitters, often used in photonics instrumentation, split light by polarization state. Edmund Optics’ anti-reflection coatings are designed for the ultraviolet (UV), visible, or infrared (IR).

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Edmund Optics offers a variety of fiber optics, including jacketed and unjacketed optical grade or communications grade optical fibers. Optical grade optical fiber is ideal for general industrial lighting or short distance data transmission. It is designed for optimal visible light transmission for digital or analog links. Jacketed fiber has increased durability while decreasing stray light. Edmund Optics also offers optical fiber components, including patchcords, collimators, faceplates and image conduits, fiber connectors, and the tools needed for cutting or stripping fibers.

Designed for use in a variety of laser and imaging systems, these components are available in a range of micro sizes for integration into a host of OEM applications. Custom sizes, variations in polishing/ ground surfaces and additional coatings are available upon request.

Our laser alignment phosphor products offer greater performance and safety to users of UV, visible, and IR lasers. They reduce problems associated with beam visualization, profiling and alignment in many applications. All ranges available in three formats. The laminated credit card-style is for low power sources and reflective viewing only. The 25-mm disk and clip-on wand style is used when frequent component positioning is required. The removable disk is positionable at an optics location to enable precise alignment, while wand format permits handling into beam path. Optical bench-mountable head format has large active area and ¼-20 threaded mounting for standard imperial post/post holder integration.

When you go to other formats, the distinction between a telephoto lens and a non-telephoto lens becomes important. Consider a nice 4x5 field camera:

Edmund Optics offers fiber-optic collimators for FC/PC, FC/APC and SMA connectors and different wavelength ranges around 350 nm to 1600 nm.

Now to zoom lenses... and the reason I mentioned that bit about retrofocus design. Typically a zoom lens is made of a prime lens group in the rear, a middle group, and then a retrofocus group in the front. That's the 'ideal' design, though often they are more complicated to deal with aberrations and distortions that inevitably come with more complex lens designs. You can get a hint of how this works in the What Is Inside a Zoom Lens? article from Tamron. Though, it is probably more accurate to say that zoom lenses take design elements from telephoto design, retrofocus design, prime lens design, and a bit of other to make a very complex system.

Edmund Optics offers the world’s largest inventory of off-the-shelf optical components, which includes an extensive selection of stock optical lenses such as achromatic lenses or aspheric lenses. Many of Edmund Optics’ lenses are offered with a variety of coating options for the ultraviolet (UV), visible, or infrared (IR) spectrum.

Edmund Optics offers the world’s largest inventory of off-the-shelf optical components. The majority of Edmund Optics’ light pipes are hexagonal in shape, which leads to 35% less light loss than for comparable square light pipes. Fused silica light pipe homogenizing rods are ideal for applications utilizing UV LED light sources. Tapered light pipe homogenizing rods offer several magnification options, including 2× or 3×. Edmund Optics offers light pipe mounts for either tapered or hexagonal light pipes, designed to offer easy system integration solutions, or to ease handling.

Edmund Optics’ optical manufacturing services include custom design, prototyping, and volume manufacturing of high-quality optical and imaging components and systems. From design to prototype to production, Edmund Optics manufactures over two million optical components and over 175,000 optical assemblies every year.

A zoom lens is useful when you are unable to move to get the crop of the scene that you want. Sometimes you can't step back further to get a wider view. Other times you can't go half way to the middle of the river to photograph the other side of the shore. You could pack a lot of lenses and select the one you want for the situation you want, or you could carry a zoom lens.

Edmund Optics offers a wide variety of neutral density filters for ultraviolet (UV), visible and infrared applications. Neutral density filter kits are available, which include a number of filters in a range of optical densities. Stepped ND filters are also available, which offer a number of optical densities on a single filter, ideal for lab or R&D integration.

'Zoom' just means that it has a range of focal lengths. That range could be telephoto, it could be below telephoto, or it could range from below telephoto to above telephoto.

Edmund Optics offers an extensive selection of large diameter optics including achromatic lenses or aspheric lenses. Many of Edmund Optics’ lenses are offered with a variety of coating options for the ultraviolet (UV), visible, or infrared (IR) spectral range.

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Edmund Optics offers a wide range of laser accessories, including different kinds of beam collimators and expanders. In particular, we have fiber-coupled collimators which are suitable for FC/PC, FC/APC and SMA connectors.

Do you allow opening this video at https://youtu.be/a2vCbdIkd6M?si=kXRO8BAyBrJudjBg (which involves sending data to that site)?

Edmund Optics offers a wide range of infrared optics, using materials like aluminum, calcium fluoride, fused silica, germanium, magnesium fluoride, sapphire, silicon, zinc selenide, zinc sulfide and other infrared materials.

The focal length of a lens determines its field of view on your camera. If it has a long focal length, it has a narrow field of view, making the things in front of you appear large in the photograph. If it has a short focal length, it has a large field of view--it's a "wide angle" lens that takes in a large area, making objects appear small.

Edmund Optics offers stereo microscopes and inverted microscopes by industry leading manufacturers, including Mitutoyo and Olympus. The Mitutoyo FS70 inspection microscope is compatible with the Mitutoyo infinity corrected objectives. The Olympus stereo microscopes offer various mounting configurations for a variety of application and system spaces. Edmund Optics also offers a variety of stereo microscope accessories, including cameras or vibration isolation tables which minimize vibrations from interfering with image quality.

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Telephoto and zoom are two completely different things. Zoom simply means that the focal length (apparent magnification) of the lens can be changed, ie, it looks like it can look at things either closer up or further away by adjusting it.

Our compact ultrafast autocorrelator is used to characterize ultrafast laser pulses originating from Ti:sapphire and Yb:doped lasers. Featuring a built-in two-photon absorption (TPA) detector, this autocorrelator is ideal for measuring ultrafast femtosecond and picosecond laser pulses at wavelengths from 700 to 1100 nm. The highly sensitive TPA detector allows for measurements of ultrafast laser pulses with high sensitivity by eliminating the need for angle tuning of the SHG nonlinear crystal.

Our suggestion: place a preview in a suitable encyclopedia article! (That feature is offered as part of our advertising package.) For example, the paper preview shown above would well fit into our articles on laser diodes and diode bars.

Edmund Optics offers a wide range of industrial and pointing lasers with different colors (red, green, violet, infrared). Some are handheld devices, while others come with cylindrical houses for easy integration.

The simple definition of a telephoto lens is a lens that has a focal length longer than the physical lens. Many lenses that are 'long' (as opposed to 'normal' or 'wide') are telephoto in design. This is because it sometimes is impractical to put that much of a barrel on the lens. In the SLR world, one often uses 'long lens' and 'telephoto lens' synonymously.

These can be freestanding, propped against a wall or cheval style, which allows you to adjust to different angles. If you'd rather not take up floor space, an ...

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There's another flip to that which is what you see in SLR photography a lot - the retrofocus design. With a Nikon F mount, the flange distance is 46.5mm. This allows the mirror to clear the back of the lens when it flips up (this is a major issue in SLR design). So the closest you can put a lens would be about 47mm away from the focal plane. But yet, there are lenses such as a 24mm lens which have a focal length that is shorter than this distance. (Note: this is part of why interchangeable lenses on rangefinders and mirrorless systems can made more cheaply - they can use simpler designs for their shorter flange distances).

Edmund Optics offers a variety of fiber optics, including jacketed or unjacketed optical grade or communications grade optical fibers. Optical grade fiber is ideal for general industrial lighting or short distance data transmission. Communications grade fiber is designed for optimal visible light transmission for digital or analog links. Jacketed fiber has increased durability while decreasing stray light. Edmund Optics also offers optical fiber components, including patchcords, collimators, faceplates and image conduits, fiber connectors, and the tools needed for cutting or stripping fibers.

I've heard it said that 50mm is the standard as far as lens focal length goes, meaning that at 50mm your camera will take a photo as close to how the human eye sees it, i.e. a similar zoom and angle of view. So, anything over 50mm is considered a telephoto (zoomed in from how you see it) and anything under is considered wide angle (zoomed out from how you see it). A fixed focal length lens will also be called a Prime lens, a variable focal length lens is a zoom. So to sum up, a lens with- 50mm is considered standard. 24mm would be a wide angle prime (only one focal length). 18-35mm would be a wide angle zoom. 200mm would be a telephoto prime. 70-200mm would be a telephoto zoom. 18- 200mm would be both a wide angle (below 50mm) and telephoto (above 50mm) zoom. Basically if you're focal length is below 50mm you're in wide angle mode and if you're above 50mm you're in telephoto mode. Hope this helps.

A zoom lens could "zoom" from a short (wide-angle) to long ("telephoto") focal length, making things look bigger and closer as you zoom in. Or it could zoom from an extreme wide-angle to a moderate wide-angle, never coming close to a "telephoto" focal length. Or any other range of focal lengths.

Ball lenses are commonly used to improve signal quality in fiber coupling applications, or for use in endoscopy or bar code scanning applications. Our ball lenses feature short back focal lengths to minimize the distance needed from the ball lens to the optical fiber. Edmund Optics offers a variety of ball lenses in a range of substrates for performance in the ultraviolet to the NIR. Half-ball lenses are also available to ease mounting or system integration.

Time Graph · Uniform Acceleration in One Dimension ... Lens Simulation for iPad · Lens ... Move the point named " Focus' " to change the focal length.

Edmund Optics is a leading global provider of optical technology solutions that has been serving a variety of markets since 1942. The company employs more than 1,250 people across eighteen global locations and continues to expand. Edmund Optics services its customers through two distinct offerings: MARKETPLACE and OPTICAL MANUFACTURING!

A 10-20mm lens is not a telephoto lens but is a zoom lens. It is not zoomed in at all. It has a short focal length, low mm. It's called wide angle. If you felt like it, you could shoot at 15mm when you feel jumpy and 16mm when you feel bumpy. You could not, however shoot at a high focal length as you could with the 300mm lens.

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A wide range of laser accessories is available, including fiber-optic beam collimators and focusers and various kinds of beam expanders.

Edmund Optics offers various kinds of off-axis parabolic mirrors, where the mirror coatings can be made of aluminum, silver or gold. Mirrors with alignment holes are also available.

Sep 13, 2024 — The Maestro2 OCT can be purchased with or without OCT-A. For doctors who already own a Maestro2 device, Topcon says most will have the option to ...

So "zoom" = focal length you can change, and "telephoto" = long focal length. A lens can be one, or the other, or neither, or both.

Edmund Optics selection of cylinder lenses include achromatic, acylinder, plano-convex, or plano-concave. Achromatic cylinder lenses provide additional color correction by minimizing chromatic aberration. Hybrid acylinder lenses are ideal for color correction, in addition to minimizing spherical aberration. Edmund Optics offers cylinder lenses with glass or plastic substrates, or with circular, rectangular, or oblong dimensions. Multiple anti-reflection coating options are available from the ultraviolet to the infrared, including UV-AR, UV-VIS, MgF2, VIS-NIR, VIS 0°, or NIR I. Edmund Optics offers full prescription data, in addition to 2D or 3D models.

Edmund Optics offers Coherent® Lasercam™ beam profilers as well as an own series of beam profilers, designed to measure a wide range of laser beam sizes, providing information to optimize laser system operation. These laser beam profilers feature high resolution and large area sensors to ensure accurate profiling of both small and large laser beams.

Edmund Optics offers various specialty mirrors, including hot mirrors which reflect 90% of NIR and IR light. We also have extended hot mirrors with improved NIR reflectance and high performance versions with an optimized multi-layer dielectric coating.

Edmund Optics offers a wide variety of spectrometers, including spectrometers that have been optimized for Raman or fluorescence spectroscopy. Raman spectrometers are ideal for Raman applications in the visible to the near infrared. The fluorescence spectrometers are ideal for use in low light fluorescence applications where the ability to detect weak signals is crucial for proper measurement. Additionally, fluorescence spectrometers feature broadband spectral response ranges for detecting wide wavelength bands along with a wide slit width for increased throughput.

Optotune laser speckle reducers remove local interferences and significantly reduce speckle noise in laser systems by dynamically diffusing the laser beam. Offering a compact size, integrated drive electronics, and vibration-less speckle reduction, Optotune laser speckle reducers are ideal for beam homogenization, 3D scanning, metrology, microscopy, and interferometry.

TECHSPEC® laser mirror substrates are manufactured from high quality fused silica and are designed for use with high power laser sources. These mirrors feature excellent surface specifications, including λ/10 surface flatness and 10-5 surface quality, to limit the possibility of reduced performance due to surface defects. The high surface quality of these mirror blanks also makes them ideal for use in demanding intra-cavity laser applications.

Edmund Optics offers a variety of optical filters for many applications, including bandpass interference, notch, edge, dichroic, color substrate, or ND. Edmund Optics also offers highly durable hard coatings for applications that require high optical densities with maximum performance.

Telephoto, roughly, means that the lens has a relatively narrow field of view, thus it can be used to look at things further away.

2020319 — My understanding is there's a bit more light loss with the Amici vs. traditional 90* prism diagonal -- and aren't are a good idea for fracs smaller than 4" ...

An 18mm lens is not a telephoto lens and it is also not a zoom lens because it has low mm and there is only one focal length. You'd call it a wide angle, prime lens.

Edmund Optics offers a wide range of diode laser sources, including machine vision lasers, life science lasers, metrology lasers, industrial and point lasers, and material processing lasers.

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Edmund Optics free-space optical isolators incorporate a Faraday rotator and are specifically designed and manufactured to provide superior performance with high isolation, transmission, and power densities. Each option effectively reduces feedback in the external cavity of diode laser systems and blocks reflections from free-space fiber coupling. These isolators enable state of the art protection for the most stable lasers in the world and are ideal for demanding laser applications.

Nonlinear crystals of either β-barium borate (BBO) or lithium triborate (LBO) are used for frequency conversion of laser sources. BBO crystals feature thicknesses from 0.2 mm to 0.5 mm to minimize group velocity mismatch and are ideal for frequency doubling or tripling of pulses from Ti:sapphire and Yb-doped lasers. The critical and noncritical phase matching LBO crystals are ideal for second or third harmonic generation of Nd:YAG and Yb-doped lasers. Nonlinear crystals with 20–10 surface quality and λ/10 (LBO) or λ/8 (BBO) surface flatness provide the broad transparency range and large nonlinear coefficient needed for the harmonic generation of fundamental laser frequencies. Each crystal features a protective anti-reflection (AR) coating that minimizes reflection and limits fogging from ambient conditions.

A "zoom lens" is a lens whose focal length can change. You twist the barrel, or push a switch on the camera, and it takes in a narrower or wider field of view, making objects appear bigger or smaller.

From design to prototype to production, Edmund Optics manufactures over 2 million optical components every year, manufactures over 175.000 optical assemblies including imaging lenses, laser beam expanders or microscope objectives and provides in-house expertise and metrology to support your custom manufacturing. Edmund Optics’ engineers can design and manufacture fully-custom components, build-to-print following customer-supplied designs, and quickly modify any of our thousands of off-the-shelf optics sold in our Marketplace.

Edmund Optics’ optical windows are offered in a variety of substrates, such as germanium (Ge), silicon (Si), N-BK7, UV fused silica, zinc selenide (ZnSe), and potassium bromide (KBr). Multiple anti-reflection coating options are available for the ultraviolet (UV), visible, or Infrared (IR).

Our high stability variable frequency optical choppers each include a set of chemically blackened photoetched chopping discs. The mini chopper is an excellent choice for applications requiring a compact package. The chopping discs come in a variety of slot apertures. We also supply lock-in amplifiers.

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Edmund Optics offers a variety of waveplates with crystalline or polymer materials, including multiple order, zero order, or achromatic waveplates. Polymer waveplates offer superior performance over a wider range of incidence angles. Multiple order waveplates are ideal for use with monochromatic light that deviates less than 1% of the waveplate’s design wavelength. Zero order retarders offer high performance over wider wavelength or temperature ranges. Achromatic waveplates offer the most constant performance over the widest wavelength or temperature ranges.

Edmund Optics offers a wide range of transmission and reflection gratings for the ultraviolet (UV), visible and infrared (IR) regions. This includes both ruled and holographic gratings. We also offer polarization gratings, transmission grating beamsplitters and other variants.

Edmund Optics offers a wide variety of laser line optics, including laser lenses, laser mirrors, laser filters, along with a variety of other components designed for laser use. Laser lenses are designed to focus, homogenize, or shape laser beams. Laser mirrors are ideal for beam steering applications. Laser filters transmit or reflect a portion of the laser light. Laser windows are used to transmit designated wavelengths or protect sensitive components or work areas from stray light.

alignment lasers, argon ion lasers, aspheric optics, autocollimators, autocorrelators, axicons, ball lenses, beam collimators, beam dumps, beam expanders, beam homogenizers, beam profilers, beam shapers, beam shutters, beam splitters, blue lasers, cameras, chirped mirrors, CO2 lasers, cold mirrors, corner cube prisms, custom optics, cylindrical lenses, dielectric mirrors, diffraction gratings, diode lasers, eye protection equipment, Faraday isolators, fiber collimators, fiber optics, fiber-coupled diode lasers, first surface mirrors, gas lasers, gradient-index lenses, green lasers, helium–neon lasers, hot mirrors, infrared optics, infrared viewers, integrating spheres, large diameter optics, laser beam characterization instruments, laser diode collimators, laser diode modules, laser line optics, laser mirrors, laser optics, laser pointers, laser safety equipment and consulting, laser speckle reduction components, laser viewing cards, lasers, lenses, metal-coated mirrors, microscope objectives, microscopes, mirror substrates, mirrors, multimode fibers, narrow-linewidth lasers, neutral density filters, nonlinear crystal materials, optical breadboards, optical choppers, optical crystals, optical filters, optical power meters, optical windows, opto-mechanics, parabolic mirrors, plastic optical fibers, polarization beam combining optics, pulse characterization instruments, red lasers, rod lenses, solid-state lasers, spectrometers, superpolished optics, telecentric lenses, transmission gratings, ultrafast optics, ultraviolet optics, waveplates, wedge prisms, yellow and orange lasers

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Edmund Optics offers high resolution 1550-nm converters for CCD cameras and handheld infrared viewers, apart from simple laser detection products such as laser beam visualizers, IR cards and laser alignment papers.

The Edmund Optics’ marketplace is a one-stop shop for the best brands and products in optics and photonics with off-the-shelf products available for same-day shipping and expert technical support via 24/7 chat or by phone or mail. With over 34,000 products from the world’s top optics, imaging, and photonics brands, the Edmund Optics’ marketplace has one of the world’s largest selections of optical components and has been voted the #1 preferred supplier of optical components for fourteen years in a row.

Edmund Optics’ telecentric lenses are available with a range of features for a variety of machine vision or inspection applications. TECHSPEC® GoldTL™ telecentric Lenses feature focus adjustment, along with iris adjustment. TECHSPEC® SilverTL™ telecentric measuring lenses includes iris adjustment in addition to a double telecentric design. TECHSPEC® CompactTL™ telecentric lenses feature compact designs ideal for high volume system integration. TECHSPEC® compactTL™ telecentric lenses are available in in-line models. PlatinumTL™ telecentric Lenses are also available to cover large sensor sizes.

Similarly, a zoom lens can be in any part of the focal length spectrum. You can have a 17-40mm zoom, which is basically wide angle (and not at all telephoto) or you can have a 100-400 zoom, which is entirely telephoto. You can also have any variety of different combinations including things like 24-250mm lenses that span from wide angle all the way to telephoto in one lens.

TECHSPEC® rod lenses are polished on the circumference and ground on both ends. Optical performance is similar to a cylinder lens. Collimated light passing through the diameter of the rod lens will be focused into a line. N-BK7 and UV fused silica substrates are available for a variety of UV, visible and NIR applications.

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Edmund Optics offers a range of laser, flat, metal substrate, focusing, or specialty optical mirrors in a multitude of reflective coating options, including protected aluminum, enhanced aluminum, protected silver, protected gold, and dielectric.

Edmund Optics offers a wide range of optomechanics that are ideal for many optical applications. The TECHSPEC optical cage system provides excellent versatility as well as easy assembly of any number of optical system configurations. Kinematic mounts or translation stages are available to ease system adjustment or positioning. A wide selection of optomechanical accessories or adapters is also available to increase system compatibility, modularity, or versatility.

Mar 5, 2022 — We have hitherto made the assumption that a lens or a curved mirror is able to form a point image of a point object.

The focal length is normally measured in millimeters (mm). A zoom lens will have two measurements, for example "18-200 mm" (a wide-angle to telephoto zoom). It zooms from a short focal length of 18 mm to a long focal length of 200 mm. A non-zoom lens, also called a "prime" lens, will have a single focal length, for example "135 mm" (a moderate telephoto).

Edmund Optics offers mounted and unmounted retroreflection prisms in a range coating options. Reflective surfaces are available with reflection coatings including aluminum and silver. Entrance surfaces are available with VIS 0° anti-reflection coatings. Due to their complex shape, mounting a retroflection prism can be difficult. To ease system integration, mounted retroreflection prisms featuring ¼-20 tapped holes are available.

Most of the time people say 'Telephoto' they just mean 'zoomed in' or in other words 'high mm' or 'long focal length' As has been mentioned, Nikon seems to say that 85mm is the shortest focal length that they will call telephoto. I have seen people call anything above 50mm telephoto.

Other answers have stated the same thing in the same technical terms which might be meaningless in this instance. There is also a practical approach.

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Laser beam analysers from Edmund Optics include devices such as profiler systems that evaluate data from beam images to provide information such as beam location, peak intensity position, stability, or beam density. For example, there are different kinds of laser beam profilers and autocorrelators for ultrashort pulse characterization.

Edmund Optics offers a wide range of laser sources, including machine vision lasers, life science lasers, metrology lasers, gas lasers, industrial and point lasers, and material processing lasers.

On the other hand, recall that bit about the complex lens design? The wider the range of the zoom, the more compromises in the design to give you that range. It comes at the expense of aberrations, less light getting through the lens (requiring longer exposures), and other distortions. The 'super zooms' of 20-200 or 15-300 have much more compromises to the design than one that has a narrower range (the classic 100-300). Some photographers try to avoid zoom ranges of more than 3x or 5x except when necessary (glass weighs a lot - if you go hiking, it might be easier to carry a zoom than 50 lbs of glass). While the zoom lenses of today are better than those from a decade or two ago, there is still some truth to that.

Edmund Optics offers helium–neon lasers from Lumentum with up to 22.5 mW output power and improved stability. They are used in interferometers and metrology, for example.

There is a wide range of metal-coated mirrors, including flat and focusing (concave) mirror, off-axis mirrors, specialty mirrors, broadband dielectric mirrors and other infrared mirrors.

Edmund Optics offers blue lasers in the form of solid-state lasers from the Coherent OBIS™ series. Also, we provide violet and blue focusable laser diode modules.

Edmund Optics offers argon-ion lasers as ultra-compact units with internal power supply. This line of air-cooled lasers provides a stable, high quality output beam from a rugged yet efficient package. The wavelength options make these lasers ideal for a variety of scientific and OEM applications. The maintenance-free sealed mirror laser tube is ruggedly supported for exceptional resistance to vibrations and rough handling. Embedded dual cooling fans, combined with an exclusive "Dual Channel" airflow design, provide quiet and highly efficient cooling of the laser tube while isolating the state-of-the-art power supply from potential airborne contaminants.

Our GRIN lenses are designed to provide a 0.55 numerical aperture, and are available with two working distance options. Lenses with a zero working distance are ideal for collimation of single and multi-mode optical fibers and laser diodes because the lens can be positioned and glued directly to the emission source. For focusing applications, or in instances where the lens can’t be in direct contact with the emission source, all lenses are available with a small working distance as well. Each lens is available uncoated (approximately 12% reflection loss), or with a BBAR coating option for R < 0.5%.

Edmund Optics offers different products for Transmissive Diffraction Gratings, like Transmission Grating that are ideal for In-Line Configurations, UV Transmission Gratings that are ideal for Fixed Grating Applications or Transmission Grating Beamsplitters ideal for Laser Beam Division.

A 300mm lens is a telephoto but is not a zoom because 300mm is high mm (in other words, 'long focal length' or 'zoomed in') but it does not cover a range of focal lengths. (You can only use that lens at 300mm, not 299mm or 472674mm) Insead, we call these lenses prime lenses. A prime lens does not cover a range of focal lengths, just one.

Edmund Optics offers a range of optical tables and breadboards. Both imperial and metric versions are available in a range of dimensions.