LENS FOCUS TEST CHART 16:9

                     (72 SECTORS)

                          REFLECTANCE

The TE161 test chart is designed for

• adjustment of camera lenses

• 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 to

   channel between greatest and shortest focal length, the individual pick-up

   tubes must be adjusted mechanically in the optical axis.

1. Select white channel. Set optical focus at greatest focal length. With shortest

focal length and divergent focus adjust the pick-up tube in W-channel until

optimum focus is achieved. If necessary optimize by alternating with optical

focus adjustment.

2. With unchanged optical focus adjustment and shortest focal length adjust

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.