Telecentric industrial lenses are specially designed to correct the parallax of traditional industrial lenses. They can ensure that the magnification of the obtained image does not change with the variation of the object distance within a certain range of object distance. This is a very important application when the objects being measured are not on the same object surface.

For ordinary industrial lenses, the closer the target object is to the lens (the shorter the working distance), the larger the image formed will be. When using ordinary lenses for size measurement, the following problems may exist:

(1) Due to the fact that the objects being measured are not on the same measurement plane, the magnification varies.

(2) The lens distortion is large

(3) Parallax means that when the distance between objects increases, the magnification of the object also changes.

(4) The resolution of the lens is not high;

(5) The uncertainty of the image edge position caused by the geometric characteristics of the visual light source.

Telecentric lenses can effectively solve the above-mentioned problems existing in ordinary lenses and do not have such judgment errors. Therefore, they can be used in high-precision measurement, metrology and other aspects. Telecentric lenses are high-end industrial lenses, usually featuring outstanding image quality and are particularly suitable for applications in size measurement.