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Sinar DB shutter - recessed lens boards?

Cameras & Camera Accessories - www.largeformatphotography.info
Which lens boards, apart from DB boards with aperture, can be used with Sinar shutter (first generation, black)? I reckon the hole in front of the blades is about 78mm dia. Is it possible to use a recessed Sinar lens board for a barrel 210mm lens that has the threaded mount "flat", at the very end of the lens? Shutter manual recommends to get the rear lens element as close to the blades as possible. Also, flat Sinar 0 and 1 boards I have bear the warning at the back "not for use with sinar shutter". Is it simply for the usual protruding of the back element of lenses in Copal/Compur/etc shutters that interferes with the shutter blades?
Date: Jan 17, 2013   


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