The series of telecentic system is developed by using a pair of base lenses to achieve telecenticity required on object and image plane. The combined telecentric 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 thereof 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. Another feature is the large depth of focus, up to several millimeters, which is extremely useful in inspection applications. C/T-mount adapters(GCO-230101~231206)are offered for coupling to CCD cameras.

GCO-23 Telecentric Lenses
(The combinations of the base lenses)

Any two of the base lenses can be combined via an interface (GCO-230101~231206) to build a telecentric lens system, for specific magnifications. Every base lens can act as either the front lens or the back lens, according to the object size or image size.

Interfaces and CCD adapters

The interface settings between the base lenses are listed in the table below.A stop is built in the interface and aligned to achieve the telecentric effect.The CCD adapters are provided along with the interfaces. Custom CCD adapters are also available on special request.

Parameter Name	Parameter Value
Type	bi-telecentric
Technical applications	inspection