SineImage YE0110 SECTOR STAR TEST CHART (36 SECTORS)
| Material | Film or HD photographic paper |
The test chart consists of 9 sector stars, distributed equally over
the picture area. The unresolved center of the sector star is 10%
of its outer diameter. Within the sector stars are two circular
lines. The inner one marks a 625 line structure, the larger
circular line marks a structure of 312 lines.
The test chart is designed for
·adjustment of camera lenses
·checking back focal distance
·checking resolution over the picture area
With the aid of a low transmission filter and by means of low level
lighting make sure that the camera is not overmodulated with the
aperture in the open position.
Optical focus: Adjust focus zoom lens at greatest focal length.
Back focus distance (lens): Adjust focus at shortest focal length
by regulating lens mechanically with adjustment screw and optimize
alternatively with a).
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.
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.
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.
