A compositional feature of focal length is the way it alters perception of depth. Short focal lengths make objects look farther apart whilst longer lengths compress distances and make objects seem much closer together. Therefore, a wide-angle lens makes backgrounds seem far away whilst a telephoto lens brings them much closer.

AccuCoat has over 20 years of experience in optical coatings, serving the commercial, consumer, defense, medical and research communities throughout the world. With state-of-the-art equipment, AccuCoat engineers are capable process designs for prototype to high-volume thin-film coatings on glass, metal and polymer optical components. Its coatings include multilayer anti-reflective (AR), beam splitter, metal reflector, IR and wavelength-specific coatings for UV, visible and infrared light regions. Customers have come to appreciate direct access to the company owners for fast answers and a professional approach to every project. That attention to detail shows in the quality of the final product.

Focal length is a technical characteristic of a lens, related to the way it works, rather than its actual size. You can experiment with focal length in your photography to change perspective, play with depth of field and zoom in / out on your subject.

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While coatings for the military may require documentation of materials, design, cleaning, processes, AccuCoat offers complete lot traceability for all of its coated parts from the moment they arrive to shipment of the coated product. All testing documents, coating curves, part serializations and certifications are provided to the customer. Our company maintains records for all of its coatings for 5 years as a standard process, and that can be extended up to 7 years or beyond, as required.

AccuCoat uses a Physical Vapor Deposition (PVD) method combined with Ion Assisted Deposition (IAD). The deposition process begins by using IAD to clean the substrate in situ prior to coating. This removes any organic residue and offers extra assurance that the coating will achieve the highest adherence. Then, once the substrate is clean, the deposition process begins with an ion beam directed at the substrate in the vacuum chamber, adding density to the evaporated film, which gives the coating better durability. AccuCoat uses an IAD process with a cold cathode plasma source, which increases the index and durability, reducing stress in the films and limiting severe wavefront deformation.

Proper cleaning of optics is a necessary step in ensuring that all optics are free of any contaminants, dust or debris. AccuCoat employs different cleaning systems, depending on the substrate, to achieve the highest quality coating. A fully robotic ultrasonic cleaning system is used for some germanium and silicon. Hand washing methods are used for more sensitive materials.

Testing is done with state-of-the-art testing chambers to meet military and ISO specifications for adhesion, abrasion, temperature and humidity.

FOV tofocal length

AccuCoat inc. is a world-class optical coating facility producing a wide range of thin-film optical coatings such as anti-reflective, beamsplitter, dichroic & metal mirror, filter coatings, and IR coatings. Please contact us to discuss your specific optical coating needs.   © 2024 AccuCoat inc. • 111 Humboldt St. Suite 8, Rochester, NY 14609AccuCoat is ITAR registered

2024426 — The focal length of a lens is defined as the distance from the center of the lens (principal point) to the image sensor of the camera. Focal ...

A lens suited to most subjects, from portrait to landscape. There is minimal distortion and can use large apertures down to f/1.8, etc. Good for portrait, nature, low light, and general use.

The easiest and best way to test the flatness of a flat lapped or polished surface is with an optical flat. Such surfaces are found on micrometers, measuring ...

Focal length

Distortion is small – vertical lines may curve but can be corrected later. It’s good for journalistic and real estate work because the angle of view is huge and so much is in focus.

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Picks out distant objects and fills the frame with a small part of the scene. The shallow depth of field is popular with portrait photographers because it throws the background out of focus.  Also used for general nature and wildlife work.

Short focal length lenses have a wide angle of view, hence the name “wide angle”. Longer focal lengths have a narrower angle of view, covering a smaller area of the scene. That’s why long focal length lenses seem to magnify the image - they capture a small part of the scene but still fill the sensor with it. A focal length of round 50mm is generally accepted as being about what our eyes see, which is why a 50mm lens is so often the standard lens that comes with the camera.

AccuCoat offers coatings on a wide variety of standard and sensitive material types from Ohara and Schott, and it also has advanced expertise in coating single point diamond turned (SPDT) including:

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Equipped with state-of-the-art spectrophotometers and environmental chambers, the in-house lab is capable of performing testing as required by the customer, whether it is basic adhesion or abrasion testing for commercial applications up to rigorous testing that ensures that the coatings meet military specifications. Further capabilities include ISO international environmental test standards for optical coatings. See the lists below for specific tests available from the AccuCoat test lab.

AR coating on germanium substrate: A manufacturer was struggling with part performance due to coatings that had been applied by a different provider. The AR coating was not holding up consistently in the environment it was intended for. AccuCoat designed a new coating to alleviate a transmission problem and created a plasma cleaning step that allows the parts to meet the demanding eraser durability test parameters. The result was that the parts exceeded the transmission performance required for the application, and AccuCoat was also able to increase the volume of the parts delivered.

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Field of View (FoV): total area that can be viewed by the lens and imaged onto the camera sensor. Working distance (WD): object to lens distance where the image ...

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International Traffic in Arms Regulations (ITAR) compliance is required by the U.S. government of all manufacturers, exporters and brokers of defense articles, services or related technical data on the U.S. Munitions List (USML). AccuCoat has been ITAR-certified and registered with the State Department’s Directorate of Defense Trade Controls (DDTC) since 2008. As required, the staff is educated on ITAR requirements and follows best practices for maintaining information security. All records pertinent to controlled projects are retained for 5 to 7 years, depending on program requirements. All of AccuCoat’s coatings are wholly U.S. manufactured.

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Very wide angle of view, up to 180 degrees. This causes considerable distortion but captures a huge amount of the scene.

AccuCoat ensures consistency by using a state-of-the-art robotic cleaning system and then employing a proprietary physical vapor deposition (PVD) process with ion-assisted deposition (IAD). AccuCoat offers AR coatings for IR applications in wavelengths ranging from 3.5 to 5 microns or 8 to 12 microns, with custom-designed solutions up to the 15-micron range.

What isfocal lengthof lens

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Focal length influences how your camera records a scene. It determines the angle of view, or how much of the scene ends up projected on the camera sensor. It controls how magnified an image looks, it influences the depth of field and can alter perspective, making objects look closer together or farther apart.

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Technically, focal length is the distance between the point of convergence and the camera sensor, but that’s not a particularly easy way to understand it. Instead, imagine a simple lens with one piece of glass focusing the light onto the sensor. The distance between the lens and the sensor is the focal distance. So, in a 100mm lens the distance between the glass and the sensor is 100mm. It’s as simple as that.

AccuCoat Inc. is a world-class optical coating facility that, for over 20 years, has produced a wide range of thin-film optical coatings such as anti-reflective, beamsplitters, dichroic and metal mirrors, filters, and IR coatings. AccuCoat works with each customer to ensure that the coatings are designed to meet their specific application needs. The following are examples of challenges that customers faced and the solution that AccuCoat was able to provide using its extensive in-house expertise:

Depth of field, how much of the shot is in acceptable focus, changes with focal length. Shorter focal lengths not only capture a wider view, but they also have a deeper depth of field. They can capture almost everything from right in front of the camera to infinity in acceptable focus. As focal length increases the depth of field decreases, so a longer lens captures a narrower band in acceptable focus.

2019711 — Focal length is the distance between the optical center of the lens, and the camera sensor or film plane when focused at infinity.

AccuCoat produces the highest quality anti-reflective (AR) coatings on infra-red (IR) substrates. From high-efficiency broadband, to narrowband and dual-band, AccuCoat can create prototypes through high-volume custom coatings that provide the performance and durability required of demanding optics applications for military, industrial, medical and commercial use. AR coatings are applied to a variety of substrates for use in applications including bar-code scanners, autonomous vehicles, displays, cameras, fiber optics, lasers, illumination systems, range finders, instrumentation, microscopes, temperature sensors and more.

Discover the fascinating world of macro photography with the Close Up Macro Lens Set 77mm. This high-quality set transforms your camera into a powerful tool ...

AccuCoat’s in-house test center is reflective of the quality found throughout the entire organization. While some coating vendors perform tests on an initial coating run and not on subsequent batches, AccuCoat’s high standards for quality control and monitoring require that a battery of tests be performed on a lot basis for all coating runs. Sample pieces are tested from every coating run, from adhesion and abrasion to spectral measurement of each coated surface. Parts are reviewed while cleaning and unloading tools.