What islensclass 10

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Types oflens optics

Coma result from the use of principle planes when considering the propagation of image through a system.  The principle planes are only really planes in the paraxial region.  As you move further from the paraxial region, the surface the rays strike is curved, affecting the focal length for these rays impacting where they focus on the object plane.  The focusing of a ray is therefore dependent on the height off the axis at which it strikes the lens.

Optical Lenses price

Opto Engineering offers a vast range of precision telecentric and bi-telecentric lenses for the most diverse requirements of the market: models for high and low resolution area and line scan sensors in a variety of magnifications and working distances; classic, compact and flat lenses, along with standard and custom solutions. The range also includes special telecentric lenses: lenses with integrated liquid lenses, zoom lenses, optical benches and other special products. Opto Engineering 360° view lenses are unique designs that make it possible to inspect an entire product while reducing the number of components in the vision system. Thanks to their special optical design, just one camera is needed to simultaneously inspect multiple surfaces of an object: the bottom and internal surfaces, or the top and external surfaces. The family includes multi-view lenses which give a single image of the object containing a variety of points of view. Many of these 360° view lenses represent an innovative way of resolving vision applications, previously considered impossible, in a simple and effective way: they are used in numerous industries, from food & beverage to pharmaceutics and automotive. Some of these extraordinary optical innovations are the fruit of Opto Engineering’s R&D, have been patented internationally, received numerous awards, and constitute an extremely valuable resource for our clients.

Telecentric lenses are used in innumerable vision applications, and in particular they form the critical component of the optical system when precise measurement is required. Non-contact measurement applications demand the use of such lenses which, thanks to their low distortion, can eliminate perspective errors (parallax effect) due to imprecise positioning or objects with strongly 3D geometries.

Cylindricallens Optics

GoogleLens

There are two types of coma: positive and negative.  Negative coma occurs when rays hitting the lens further from the paraxial region focus closer to the axis than rays closer to the paraxial region. Positive coma is just the opposite, with the further rays focusing farther from the axis (figure 1).

Opto Engineering offers a wide range of macro lenses, designed for close working distance applications which demand very high precision and close to zero distortion.

6 types of lenses

This family includes: special remote controlled models with integrated liquid lenses for fast and precise focusing; lenses for SWIR and UV applications; lenses with Scheimpflug adjustment and variable magnification lenses.

Lensformula

Convexlens

Since coma results from a change in magnification with height, for there to be no coma, the magnification must be constant everywhere:

Coma is easily seen by holding a lens in sunlight and then tilting it, creating an image that tails off to one side (figure 3).

where no, yo, αo and are the index of refraction, height, and slope angle of a ray in object space and ni, yi, αi are the index of refraction, height, and slope angle of the ray in image space.

In machine vision applications, choosing the right lens is essential to obtaining high quality images suited to efficient and accurate processing. In many cases, the lens is the starting point for the construction of a machine vision system, although the result also depends on the resolution of the camera and the pixel size.

Physically, this means the ratio of the angle at which the ray enters the lens to the angle at which the ray leaves the lens should be constant across the lens to avoid coma.

A stop can also be placed in the system.  The position of the stop affects the light rays getting through.  A positive or negative coma can be created by selective positioning.  This coma created by the stop can be used to cancel out coma present in the system independent of the stop.

This ratio can be assured if the rays entering a lens originate at infinity (they are parallel).  This can be done using a combination of lenses (figure 4).

Opto Engineering’s vast range of fixed focal length lenses includes lenses for small, medium and large sensors, with a variety of focal lengths, apertures and resolutions.