What is a TC and why is it useful?

What is a telecentric lens, and why is it so useful in optical applications? Telecentric lenses are a special class of optics designed to collect only collimated light ray bundles, parallel to the optical axis. This unique feature eliminates perspective errors and ensures consistent magnification, regardless of the object's location.

This makes telecentric lenses ideal for measurement applications, where precise and accurate dimensional analysis is crucial. Unlike conventional lenses, telecentric lenses maintain constant magnification, avoiding distortions caused by changes in working distance.

The illustrations show the distinction between telecentric and common optics (entocentric) lenses like fixed focal length lenses. As entocentric lenses gather rays that are deviating from the optical axis. This enables them to cover a wide field of view, however these lenses are not appropriate for determining an object's actual size because magnification varies with working distance.

Bi-telecentric lenses, which are telecentric in both object and image space, offer even greater accuracy by ensuring symmetrical point spread functions and consistent magnification throughout the depth of field.

Opto Engineering telecentric lenses do not integrate an iris or focusing mechanism. Adjusting the aperture can be easily done upon request before shipping, without additional costs or delays. This design choice minimizes mechanical play and distortion, ensuring optimal performance. Opto Engineering telecentric lenses provide unparalleled accuracy and reliability in optical measurements, making them the ideal choice for precision applications.