|Pye Mk5 842131 Image orthicon Camera front and rear view|
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The back door covering the rear of the scanning yoke is also missing.... The inner section of the yoke, comprising the scan and alignment sections pull out through this rear access panel and the big 4.5" Image Orthicon tube fits inside it. In this manner the I.O. tube could be replaced quickly if it failed.
The 4 lenses on the turret had an iris
gear ring which meshed with the iris drive servomotor in the center
of the turret. This motor was controlled by the vision engineer to give
the correct amount of exposure for the tube.