30
also mainly responsible for the sharpness of the images.
Anyone who would like to change the FFD of his own camera
should now do so by simply changing the spacer, and only with the
spacer. He has not to polish any other surface, ot to insert anything
else between the lens port and the film plane. For that purpose, you
can order some aluminium spacers (0.35mm) to Aaton, and then sa-
fely change the FFD of your camera.
2.5.2 Polishing a Spacer
In order to fine-adjust the thickness of a specific spacer, Aaton car-
ries a specific tool (ref 09 202 92) designed to hold the spacer firmly
and evenly against Emery paper. When polishing a spacer, always
work on a perfectly flat worktable or stone, and be sure to hold the
tool firmly.
2.5.3 Changing the Spacer
The spacer is placed between the lens port and the camera body’s ti-
tanium lens holder. If you’re camera is equipped with a PL lens port,
you first need to remove the lens locking ring: screw two or three
turns its stop (placed on the bottom, inside the PL port), and turn
the ring counterclockwise.
Remove the lens port by unscrewing its screws. Then remove the
aluminium spacer gently.
Once you have placed a new spacer, replace the lens port, then the
lenses locking ring. Do not forget to unscrew two or three turns the
locking ring stop, if you have a PL lens port.
2.5.4 Adjusting the Viewing Screen
Because you have changed the distance separating the base of the
lens and the camera body, the image on your viewing screen might
now appear to be less sharp than usual. Most likely, you may need
to readjust the precise focus of the viewing screen. Refer to the 2.2.9
section of this chapter to proceed.
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