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Two unthreaded 8.5mm diameter holes @ 35mm centres with a 1/4" 20tpi threaded hole central between them along the 'optical axis' of the clamshell.
They are usually mounted using two M8 (20mm or 25mm long) stainless steel cap-screws
Larger clamshells have four holes with pairs at 35mm centres at 90 degrees to the others.
Note: the 1/4" is to allow them to be mounted directly to most photographic tripods.
There is also a 1/4" threaded screw on top of the clamshell to allow the attachment of a camera or mini ball-head to the clam.
Last edited by Kunama; 21-09-2013 at 09:32 AM.
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