Hello, I recently acquired a Schneider - Kreuznach Angulon f:6,8 F=16,5 cm lens mounted in a Compur Shutter (appears to be the #2, has 4 blades). On slow speeds the shutter would sometimes stick so I removed the rear element and found that the front element is ever so slightly blocking the four blades of the shutter. The blades have chipped off the black paint on the front element in four places where they catch. After removing the front element the shutters work fine. It would seem that what I should do is add a very small shim, (less then half a millimeter I guess) to the front shim to keep it from catching the shutter blades. Consequently there would be no way to increase the rear element to match. So I'm wondering how "bad" would be the effect of shimming the front element slightly away from the rear element? Further, does anyone have any more information on this lens and should it perhaps be mounted in a different shutter? I was able to get some information from Schneider Optics web site about the lens: http://www.schneideroptics.com/info/vintage_lens_data/large_format_lenses/angulon/data/6,8-165mm.html Thank you for any help, Bill Snodgrass
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