Computar TEC55 – 55mm Telecentric Lens (C Mount)
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55mm F/2.8 Telecentric Lens
The Computar TEC-55 is a 55mm telecentric lens designed for cameras with a 2/3 Format sensor array. It has a minimum working distance of 0.14 meters which produces an object size of 17x13mm. Locking screws secure both the focus ring and aperature.
About Telecentric Lenses
In machine vision systems requiring accurate measurements an orthonormal view of the object (i.e. with no object sides imaging) is needed so that correct linear measurements may be performed. Furthermore, many mechanical parts cannot be precisely positioned (i.e. because of vibrations) or a measurement must be performed at different depths or, even worse, the object thickness (and therefore the object surface position) may vary; nevertheless, software engineers do need a perfect correlation between imaged and real dimensions.
On the left is an image of an internal spline on a cylindrical object taken with a telecentric lens (top) and the same object viewed by an ordinary lens (bottom). On the right an image of two identical machine screws set 100 mm apart, taken with a telecentric lens (top) and with an ordinary lens (bottom).
|Max Image Format||8.8mm x 6.6mm x 11mm|
|Working Distance||0.14m - Infinity|
|Filter Size||M43.0 P-0.75mm|
|Back Focal Length||29.8mm|
|Dimenions||53.0mm (D) x 92.9mm (L)|
|Computar TEC-55 Datasheet||93 kb||Download File|