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TE148 A LENS FOCUS TEST CHART (36 SECTORS) 16:9 Reflectance

The TE148 A LENS FOCUS TEST CHART (36 SECTORS) 16:9 Reflectance is designed for adjustment of camera lenses and checking back focal distance.
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Date:2018-02-03  Browse:
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TE148 A LENS FOCUS TEST CHART (36 SECTORS) 16:9 Reflectance  

TE148 A LENS FOCUS TEST CHART (36 SECTORS) 16:9 Reflectance

TE148 A LENS FOCUS TEST CHART (36 SECTORS) 16:9 Reflectance

 
The TE148 A LENS FOCUS TEST CHART (36 SECTORS) 16:9 Reflectance 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 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 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.
 
 
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