With standard lenses an object appears to be smaller or bigger when it is
closer or farther away from the lens. Unlike common optics, telecentric lenses
only accept incoming ray bundles that are parallel to the optical axis;
therefore the object size remains unchanged. This is essential when you must
measure objects that cannot be precisely positioned (e.g. on a conveyor belt).
Moreover, telecentric lenses eliminate any perspective error and are therefore
perfect when thick objects must be measured.
Telecentric lenses also outperform standard lenses when it comes to
distortion: An image is distorted when straight lines in the object space
appear as curved lines in the image space. Distortion is measured as a percent
deviation. Opto Engineering telecentric lenses feature incredibly low
distortion, typically under 0.05 % and deliver extremely accurate geometrical
Special features of bi-telecentric
Bi-telecentric lenses are also telecentric on the detector side. This
Increased Field Depth
Even CCD illumination
Constant magnification even when the CCD is not perfectly positioned
Bi-telecentric lenses are able to deliver incredibly accurate measurement on
many different precision parts.
Opto Engineering bi-telecentric lenses are specifically designed for real
industrial applications. The lenses have a fixed design with no adjustable
focus or aperture mechanisms to withstand vibrations and ensure accurate and
Characteristics of the Opto Engineering TC DP
Opto Engineering TC DP are double port bi-telecentric lenses supporting two
different cameras to measure objects with different magnification factors. 2x
and 4x options are available for imaging one half or one fourth of the full
FOV: this can be simply accomplished by switching from one camera to the other
with your software application.
Since this technique doesn’t require any moving mechanism, the magnification
repeatability is totally assured, thus providing exceptional measurement
accuracy with no need of re-calibrating after zooming.
Opto Engineering TC DP are suitable for any camera up to 2/3 format, they can
be mounted on CMHO clamping mechanics and fit collimated illuminators and ring
light designed for standard TC series.
Magnification between 0.093/0.186x and 0.072/0.288x
Object field of view between 9.6 x 7.2 mm and 239.8 x 179.9 mm
Telecentricity <0.1° resp. <0.08° when magnification increases