andrew_moore1

I'm a little confused about lenses and their circles of coverage. I plan to use a 6x6 roll film back on a view camera. Since I want to use movements I need a lens that covers slightly more than the 80mm (or so) diagonal of the film. However, if a lens covers more than the diagonal, won't part of the image be cropped off, effectively making my standard lens more like a telephoto? Or are the differences so small relative to the film area that they aren't worth worrying about?

In order to simplify my lens selection, are there any "rules of thumb" governing how much image circle coverage beyond the film area I'll need in order to allow movements? If the camera allows, for example,

a 50mm shift do I simply look for a lens that covers 50mm beyond the film area?

No, contrary to popular belief, the LTM lenses are NOT identical to

the M ones in all respects. However they are mostly the same,

including optical formulas. I believe the 35 has a different (larger)

hood than the M version, and it's possible (though I cannot confirm)

that the LTM lenses focus only to 1 meter instead of 0.7 (or maybe

the barrel just isn't marked for 0.7) -- not sure what the real story

is there but if close focus is important to you, you might check it

out. I do know that on at least some M3's for example the rangefinder

will not focus closer than 1 meter. The lens might be able to,

however.

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. The optical formulas are the same, as are most other aspects of the

lenses, but

\they aren't identical.