LENS FOCUS TEST CHART (36 SECTORS) 16:9

REFLECTANCE

The TE148 test chart is designed for

x adjustment of camera lenses

y checking back focal distance

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.

a) Optical focus: Adjust focus of zoom lens at greatest focal length.

b) Back focal distance (lens): Adjust focus at shortest focal length by regulating lens

     mechanically with adjustment screw and optimize alternatively with a).

c) Back focal distance (pick-up tubes): If focus varies from channel between greatest and

    shortest focal length, the individual pick-up tubes must be adjusted mechanicallyin the

    optical axis.

1. Select white channel. Set optical focus at greatest focal length and divergent focus

    adjust the pick-up tube in W-channel until optimum focus is achieved. If necessary

    optimize by alternative with optical focus adjustment.

2. With unchanged optical focus adjustment and shortest focal length the red and blue

    pick-up tube until optimum focus is achieved. Image focus (focus adjustment) is

    maintained at all focal lengths (zoom-in) and constant distance from object by

    means of back focal distance adjustment.