Fixed viewing angle, fixed magnification, large depth of focus, large depth of field imaging.
The series of telecentric system is developed by using a pair of base lenses to achieve telecentricity required on object and image plane. The combined telecentric lens systems is a focal lens system with an aperture stop located at the common focus of the front and back lens, resulting in the chief ray being parallel to the optical axis in both object and image space. Both the entrance and exit pupil are at infinity. A constant perspective or viewing angle and a constant magnification can therefore be achieved in the cases when the object and image surface are tilted with respect to the optical axis or the lens is defocused on either object surface or image surface.