What is it about?
A telecentric lens has the unique property of maintaining a constant magnification of images (object) over a specific range of object distances. This property lets inspection systems make accurate dimensional measurements of two and three dimensional (2D & 3D) parts and components of differing heights/sizes. Telecentric lenses actually take advantage of an old concept that only recently has found successful application in optical metrology. There are three basic forms of telecentric lenses, and this paper addresses what form of telecentric lens might be best for your system application. This paper tries to take out the “math” behind telecentric lenses and provide you with a clear understanding how they work
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Why is it important?
Although telecentric lenses won’t fit every machine-vision need, they have important roles to play when you need accurate measurements that do not all take place in the same plane
Perspectives
In most conventional lenses the aperture stop is located within the lens assembly. The images of the aperture stop, that is, the entrance or exit pupils, are made up of converging light rays. In a telecentric lens, the aperture stop is located at the focal point of the lens. Due to this unique position of the aperture stop, the light rays that form the images of the aperture stop travel parallel to the optical axis and are considered to be located at infinity.
CEO Stuart W Singer
Schneider Optics, Inc
Read the Original
This page is a summary of: Telecentric lenses simplify noncontact metrology, March 2026, SPIE,
DOI: 10.1117/12.3084332.
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