Optical focus: Adjust focus of zoom lens at greatest focal length.īack focal distance (lens): Adjust focus at shortest focal length by regulating lens mechanically with adjustment screw and optimize alternatively with a).īack focal distance (pick-up tubes): If focus varies from channel to channel between greatest and shortest focal length, the individual pick-up tubes must be adjusted mechanically in the optical axis.
With the aid of a low transmission filter and by means of low level lighting make sure that the camera is not over modulated with the aperture in the open position. It shows a 72 sector Siemens star on a white background.
The YE0121 test chart is designed for the adjustment of camera lenses and checking back focal distance.
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