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Hi all,

I have a couple of Schneider lenses in COPAL NO 0 shutters. Both shutters have a little lever demarked X W on the side.( could be M X of course!)

This lever has a function I would presume but I have no idea what.

Any ideas ??

This is the M/X flash sync setting lever. the M is for use with flash bulbs and it allows for a short delay after firing the flash before opening the shutter, this is to ensure the bulb reaches peak brightness. The X setting is for electronic flash.

Thanks Joanna,

Think I can safely say that it won't be something I ever use !!

Cheers