Part 3: Exit pupil In addition to the lens aperture, the magnification plays a key role in image brightness. The larger the image on the retina, i.e. the larger the area on which available light is distributed the darker the image. The key factor is the exit pupil which takes these two effects into consideration.
With optical images, dispersion results in unwanted visible color fringes and blurring. ZEISS uses SCHOTT FL glas to guarantee the highest image quality.