Features 150° wide-angle photographs Suitable for all smartphones and Tablet PCs Simple and fast adjusting via clip Description Made from pre...

Focal length is usually indicated both on the side of the lens barrel and sometimes on the front of the lens, along with the lens diameter.

Focal length

Specs Item Number: 625801 Warranty Limited Warranty is one year, which converts to the Explore STAR Transferable Extended Life of the Product Wa...

Throughout this course, we’re referring to six essentials of photography. However, it is important to mention that this could in fact be five! Why? Because images can be recorded without a lens on so-called pinhole cameras (or camera obscuras).

Focal length inphotography

Description This special T2-Ring for Canon DSLR Camera offers a extreme short light-path of only 1,5mm. Regular T2-Rings needs a light-path of ab...

FOV tofocal length

Features Variable camera adapter For eyepiece projection and prime focus Includes a short prime focus adapter from 1.25" to T2 thread Suitable fo...

Features Camera-specific bayonet adapter Canon EOS Large female thread M48x0.75 mm Free inner diameter of 41,2mm No vignetting for full format se...

Description Connect your Bresser Microscope or Telescope with a Nikon SLR camera and take images or videos of your observed object! The Bresser T-...

Aperture refers to the opening in the lens that controls how much light reaches the sensor. This is indicated in the format 1:2.8, for example, with the second set of numbers indicating the maximum aperture.

Focal lengthcamera

Description This adapter allows you to attach the 3-inch 0.7X Field Flattener Focal Reducer (FFFR507X-00) on optical tubes with a 2-inch focuser. ...

Typically, lens names are formatted like this: Canon EF 24-70mm f/2.8L II USM Lens or Nikon AF-S 50mm f/1.8G. Each of these numbers and letters relays essential information, such as focal length, maximum aperture, lens version and focusing motor. Other features specified can include stabilisation, filter diameter and focusing distances.

Some lenses feature a fixed aperture. Catadioptric, or mirror lenses, which used to be fairly common, usually feature a longer focal length, such as 500mm at a fixed aperture of f6.3. Most telescopes are catadioptric.

Description This thread-on adapter connects Explore Scientific’s 3-inch Self-Centering Focuser to its 3-inch Field Flattener / .7x Focal Reducer. ...

Features Connection of accessories with different T2 thread sizes Adaptation of 2 inch color and nebula filters between camera and telescope Inte...

However, recording an image without a lens is far more complex, and doesn’t afford the photographer the same creative freedom. Essentially, without a lens, you're shooting at a very small fixed aperture. Thanks to the variations in magnification they offer, lenses allow us to shoot many different objects, which simply wouldn’t be possible with a camera obscura.

Description Nearly everyone that is starting to observe the night sky wants to store the images that he sees through the telescope. With the new B...

Description Connect your Microscope or Telescope with a Canon EOS SLR camera and take images or videos* of your observed object! T-Mounts are the ...

focallength中文

Features Camera-specific bayonet adapter Canon EOS Large female thread M48x0.75 mm Free inner diameter of 47,5mm No vignetting for full format se...

Focaldistance vsfocal length

These elements serve to direct the light to a single focal point so that it can accurately be recorded by the sensor (9) once the mirror (7) flips up (triggered when you press the shutter button). Mirrorless cameras work the same way, but do not have the mirror or prism.

Description Explore Scientific Adapter to allow the use of the FFFR507X-00 3" 0.7x Corrector on the 2.5" Hex focuser Specs Item Number 510...

Description Explore Scientific’s 50mm (2") T2 Camera Adapter is perfect for all DSLR cameras to attach to any telescope with a 2-inch or larger fo...

Lenses with shorter focal lengths provide a much wider angle of view and less magnification. This makes them better suited to landscapes than to product photography.

Description This adapter replaces the M42x0.75 Adapter for CCD Camera that comes standard with the Explore Scientific 3-inch Field Flattener/0.7x ...

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Features Extension sleeves M48x0,75 in set Five extension sleeves: 30, 20, 15, 10, 5 mm Use with correctors and field flatteners Distance adjustm...

Features This is a field flattener for refractor-type telescopes with a focal ratio of f/5 to f/7 Causes no change to the telescope focal length ...

Focal lengthformula

Features Universal adapter to assemble the smartphone to a spotting scope or telescope For 31.7mm/1.25" eyepieces Housing diameter: 32-34mm Des...

Some lenses will feature two maximum apertures (shown as 1:4-5.6). This means that, as you zoom, the aperture capability changes. So at the shortest focal length, you may be able to shoot at f4, but once you zoom to the longest focal length, the widest aperture you’ll be able to shoot at will be f5.6. Generally lenses with wider apertures are favourable due to their increased light-capturing capabilities.

Description Adapter 2" with brass locking ring for 1,25" eyepieces. The integrated T2 thread adapts DSLR or astro-cameras (*appropriate T2 ring fo...

Features Universal adapter to assemble the smartphone to a spotting scope or telescope For eyepieces up to 68 mm diameter For smartphones with a ...

Lenses focus the light onto the recording medium, which allows an image to be recorded. As you’ll see from the illustration of a DSLR camera below, light enters the lens and passes through the front element (2) before reaching several lens elements (3, 5 & 6).

Longer focal lengths offer a narrower angle of view and more magnification, which means they are better suited to sport or wildlife photography than architectural photography.

Description For Prime Focus Astrophotography by using Pentax 645D Camera This camera adapter is for prime focus astrophotography by using VSD100F...

Prime (or fixed) lenses feature a fixed focal length. Available in a range of focal lengths, these lenses are known for delivering high-quality images. They also generally offer much wider apertures than zoom lenses do.

Zoom lenses provide a variety of focal lengths. This makes them very versatile and reduces the need for multiple lenses.