I have a compur shutter that I need to try to find a main spring for.  The
shutter is a dial set compur.  O.D is approx 79mm (about 3.1 in) and the
thread diameter for the flange is about 44mm (about 1.75 in).  Markings on
the face say D.R.P No258648 D.R.G.M.  Patent dates are March ...

Here's the Q:
 I recently obtained a Super Angulon f-5.6 /65mm
which according to Schneider it has an image circle at
f/22 of 170mm, adequate for 4x5. Which is what I use it for.

Is the resolution of large format lenses the same as small and medium
format lenses?
I have often wondered about this.
Also: Is the extra cost of a schneider, rodenstock or Nikon lens worth

My neurotic block of text:
I have taken a keen interest in classic lenses like
some of you might be into. I am very interested
in studying on these jewels so I can learn what is

I bought a box of several apparently unused Rodenstock-Ysarex 127 mm
f/4.7 front cells.
There are 2 elements in it, the front being a meniscus (concave-front,
concave rear, roughly 45-50 mm f.l.), and the rear element being

 Yes I dropped the lens, even worse on concrete. The shutter in theory
has been repaired. But the elements I fear are damaged as well, ever since
I got the repaired shutter back the lens produces areas of what appears to be flare.
It is usually appearing approximately half way up ...

Great new camera maker at insanely low prices!
Very beautiful new design! Fully built or in kit
form, pinhole cameras too.
http://stores.ebay.com/Aletta-Photographic

I'd like to buy a crown graphic special, but how can I know if a model has the Graflock back or not.
Serial number?
thx
Sam