The Double Cable Release is intended for use with the Auto Bellows, and allows the auto diaphragm of a Zuiko lens to be closed just before the shutter is released.
The shorter of the 2 cables is attached to the camera. The longer cable, which has a red ring near its tip, is attached to the lens mount of the Auto Bellows; the socket is on the same side as the smaller knob.
The length of the needle in the longer cable must be adjusted so that the shutter is tripped just after the diaphragm is fully closed. This adjustment only needs to be done once, and has to be done when there is not a film in the camera. There are instructions in the manual for the Bellows.
|US catalog no.||104-110|
Extract reproduced with permission from the copyright owner, Olympus Optical Co., Ltd
ADJUSTING THE DOUBLE CABLE RELEASE (prior to film loading)
• The two needles at the ends of the double cable release must be adjusted before loading film in the camera.
When using standard lenses or the Zuiko Macro Lens 50mm F3.5 with the Auto Bellows, you can retain automatic stop-down exposure operation by using the double cable release. To ensure proper operation, the double cable release must be adjusted to synchronize the actions of the lens diaphragm and camera shutter at the moment of exposure.
In auto bellows operation, the diaphragm blades must close to the pre-selected aperture at the moment the shutter release is triggered. To assure this synchronization, the longer needle length must be adjusted by turning the knurled ring. The longer needle (upper in photo, left) is connected to the lens mount board and the shorter needle (lower) is threaded into the shutter release button on the camera.
Use the following procedure to test the synchronization of the cable release and repeat it until proper operation is assured. (Ascertain that the selector lever of the OM-2 is set at the “MANUAL” position prior to steps below.)
• Timer Screw
To take time exposures (over 1 second), first rotate the timer screw counter-clockwise and press the double cable release plunger. Tighten the screw until the plunger remains depressed even after your finger is removed. When the exposure has been completed, loosen the timer screw. The plunger will then return to its original position.
OLYMPUS OPTICAL CO., LTD.
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