Original sentence: At the film or image sensor, all of the chief rays from these lenses hit "straight on", or at zero angle of incidence.Image space telecentric lenses have an exit pupil infinitely far in front of the lens; that is, if you look in the back of the lens, the apparent aperture is very far away.Many lenses that have been specially optimized for digital SLR cameras are nearly telecentric on the image side, to avoid the vignetting and color crosstalk that occur in color filter array-based digital image sensors with oblique incident rays.The Olympus Four Thirds System uses this approach.This property minimizes any angle-of-incidence dependence of the sensor, or of any beam-splitter prism assembly behind the lens, such as a color separation prism in a three-CCD camera
Edited sentence: At the film or image sensor, all of the chief rays hit "straight on", or at zero angle of incidence.Image space telecentric lenses have an exit pupil infinitely far in front of the lens; this is, if you look in the back, the apparent aperture is very far away.Many consider the format to be the best  available in a DSLR,  a welcome step away from large bulky  35mm sensor sized DSLRs, and a significant advance on  small APS-C sensor DSLRs using older 35mm lenses designed for a larger sensor format.The Four Thirds (4/3) sensor format has been extremely sucessful for Olympus in their  advanced  technology DSLR cameras, which  utilise the  4/3 sensor  and their telecentric ZD lenses to produce remarkably sharp images.The Olympus Four Thirds System specifies a very distant exit pupil (nearly image side telecentric lenses), to avoid the vignetting and color crosstalk that occur in Bayer pattern image sensors with oblique incident rays.This property minimizes any angle-of-incidence dependence of the sensor, or of any beam-splitter prism assembly, such as a color separation prism in a three-CCD camera, behind the lens