User's Guide

Aaton Camera body
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2.3 The variable shutter
Concept
The reflex mirror shutter diverts the lens rays to the viewing screen while the
claw pulls the film down to the next unexposed film frame. It is made of a
180° glass mirror, and a 180° black metallic shutter hiden underneath the
mirror. The metallic shutter can be slid (un-hidden) to four-positions which
make for 180°, 178°, 150°, 144° shutter opening angles.
Adjusting the shutter
To adjust the shutter opening angle, unscrew the tool marked Sh located in
the rear of the carrying handle. Make sure the battery has been removed
from the camera, remove the lens port cap.
Locate the tool guiding hole to the lower right of the inside lens holder. Gen-
tly rotate the shutter at its base with your finger until the brass driving gear is
centered underneath the tool guiding hole.
Insert the Sh tool through the guiding hole and into the brass gear. Rotate
the tool until the appropriate notched angle setting is reached ; turning coun-
ter-clockwise reduces the shutter opening, turning clockwise increases the
opening.
A shutter blade carrying the angle values is visible at the left edge of the mir-
ror. Make sure the white line to the immediate right of the 172.8°, 150° and
144° markings meets the left edge of the mirror.
When the adjustment is done, remove the tool and store it back in the carry-
ing handle.
Always unplug the power
Each time you have to put a finger inside the camera body,
you must remove the battery. If by mistake the camera starts
running while your finger is touching the mirror shutter, the
mechanism can be seriously damaged (and your finger too).
Shutter angles
• 180° for filming 25fps under 50Hz HMI lighting, and 24fps
under 60Hz.
• 172.8° for filming at 24fps under 50Hz HMI lighting.
• 150° for filming at 25fps under 60Hz HMI lighting.
• 144° for filming an NTSC monitor at 24fps while minimizing
the roll bar visibility.
Brass driving gear
Tool guiding hole