For example, with a pinhole lens, the optical axis, the line between an object and its image and the line segments from the optical axis to the object point and from the optical axis to the image point form similar triangles. This means that object height and image height are always proportional and a pinhole lens can have no distortion.

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Distortion in opticsexamples

A more obscure type of this aberration is stereoscopic distortion. This is the type of distortion you need to correct for if you want to image a sphere onto a plane and make sure that the image is always circular. For this type of distortion, the ideal image height is given by y = 2*f*tan(Θ/2). When plotted, stereoscopic lies between f*tan(Θ) and f*Θ distortion.

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The Cold Harbour Cine-NV line of NVG Camera Adapters directly connects any milspec PVS-14 eyepiece to a variety of cinema, mirrorless, and DSLR lenses. By connecting the night vision device directly to the camera lens, any unwanted artifacts such as stray light, and optical deviations (shaking) between the recording lens and the night vision device are completely eliminated giving the most true-to-life rendition of what looking through a night vision device should look like. Offered in a variety of lens thread sizes to suit any photographer and videographer's existing lens suite, the Cine-NV Camera Adapter is made to provide the most secure, shortest optical distance to the host lens that only a direct-mount ring can provide, completely eliminating any vignetting. Direct mounting also allows for full eyepiece diopter travel to dial in optimal focus.

Imagedistortion inradiography

To see what lens thread size you require, simply look at the front of your lens and note the number denoted by the symbol Ø.

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A simple, therapeutic, inexpensive, way to correct several visual disorders. • Provide an immediate correction. • They are more comfortable, more cosmetically ...

Made of durable 6061-T6 aluminum, the Cine-NV Lens Adapter threads into the female eyepiece threads of your PVS-14 style lenses.

Distortion in opticscalculator

Any deviation of an image from its ideal shape is called distortion. For example, if the image of a rectangle is not a rectangle, the lens that produced it is said to suffer from distortion. If you have arrived here from our Optical Aberrations page, you know where this aberration fits in the grand scheme of things. So let’s just get down to a description of the various types of distortion.

With some lenses, such as the conoscopic lenses we use for our scatterometers, we are not attempting to map an object height to an image height. We are trying to measure, for example, light scattering as a function of angle. We could do this for a lens that is corrected for f*tan(Θ) distortion, but we’d be forever taking arctangents. Our lives become much simpler when the image height is proportional to the object angle rather than the object height. In this case, the ideal image height is given by y = f*Θ. Any deviation from this ideal is referred to as f*Θ distortion.

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Matte hardcoat anodized, the lens adapter offers matte box-levels of performance between the night vision eyepiece lens and the host camera's lens for the best possible photo- and videographic results.

NOT compatible with L3 PVS-31A, GPNVG-18, Infiray Jerry14 and Jerry31, or Optronics Lenses (without additional adapters).

Pincushiondistortion in optics

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Created to provide unmatched product knowledge and expertise in night vision and thermal devices in Canada and beyond, Cold Harbour Supply is dedicated to providing cutting-edge electro-optics, raising standards of end-user education, and offering unparalleled customer service and support.

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Sun glasses and LCD screen are examples of polarisation.

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Note that while a lens may fit, specific focal lengths are most optimized for this purpose. We have found that focal lengths ranging from 24mm to 55mm to be best with optimal focal length to be around 28mm for full-frame (not APS-C) cameras. Cinema and other medium-format cameras should adjust accordingly.Do not over tighten, we suggest mounting the night vision device on the adapter ring BEFORE mounting the adapter to the camera lens to avoid the adapter ring binding to the camera lens.Tested to be fully compatible with the following PVS-14 pattern eyepieces: Noctis Technologies (formerly Carson Industries), Fujinon, Qioptiq, Salvo Engineering, RPO 2.0, 3.0, and Photonis Defense Boomslang eyepieces.

First, the magnification of an optical system is defined as the ratio of the image height to the object height, and the magnification is assumed constant with respect to field. In other words, in a distortion-free optical system, the distance from the optical axis to any image point (the image height) is proportional to the distance from the optical axis to the corresponding object point (the object height).

The complexity comes in when we introduce angles. Again referring to the pinhole camera, let’s define the angle between the optical axis and a line through the object point, the center of the lens and the image point as Θ. If the distance from the pinhole to the image plane is f, then the image height, y, is given by y = f*tan(Θ). A pinhole lens is distortion-free, so this equation always holds. In other types of lenses, there can be distortion, which is defined as the difference between the actual image height and the ideal image height calculated from y = f*tan(Θ).  This is, of course, f*tan(Θ) distortion.

We have designed and built lenses with all of the above types of distortion correction. If your project needs distortion-corrected lenses, please give us a call at (651)315-8249, or fill out our contact us form.

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