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A telecentric lens is a special optical lens (often an objective lens or a camera lens) that has its entrance or exit pupil, or both, at infinity. The size of images produced by a telecentric lens is insensitive to either the distance between an object being imaged and the lens, or the distance between the image plane and the lens, or both, and ...
VSP Vision Care (VSP) is a vision care health insurance company operating in Australia, Canada, Ireland, the United States, and the United Kingdom.It is a doctor-governed company divided into five businesses: “eye care insurance, high-quality eyewear, lens and lens enhancements, ophthalmic technology, and connected experiences to strengthen the relationship between patients and their eye ...
Secondly, it only applies to an object-space telecentric lens. Third, it loses the point of how a telecentric lens actually works. What makes a lens telecentric is not that all the rays are "about parallel" to the optical axis. The properties of a telecentric lens come specifically from the fact that the chief ray is parallel to the axis.
comparison of telecentric lenses: Image title: Comparison of a conventional lens (1), object-space telecentric lens (2), image-space telecentric lens (3) and bi-telecentric lens (4), assuming the images are in sufficient focus by CMG Lee. Width: 100%: Height: 100%
The two principal planes of a lens have the property that a ray emerging from the lens appears to have crossed the rear principal plane at the same distance from the optical axis that the ray appeared to have crossed the front principal plane, as viewed from the front of the lens. This means that the lens can be treated as if all of the ...
Regarding your point 2: the image is a diagram illustrating the specific point being made in the text. The property described is true of all lenses, telecentric or not. The lens depicted is, in fact, not telecentric.--Srleffler 04:19, 7 March 2008 (UTC) The 'co-incidence' is that you happen to have illustrated a telecentric lens !
The lens design can be changed even more: in colour apodization the lens is modified such that each colour channel has a different lens aperture. For example, the red channel may be f /2.4, green may be f /2.4, whilst the blue channel may be f /5.6. Therefore, the blue channel will have a greater depth of field than the other colours.
Orthographic projection (also orthogonal projection and analemma) [a] is a means of representing three-dimensional objects in two dimensions.Orthographic projection is a form of parallel projection in which all the projection lines are orthogonal to the projection plane, [2] resulting in every plane of the scene appearing in affine transformation on the viewing surface.