Quote Originally Posted by sanking View Post
Spacing that is too wide can definitely reduce coverage wtih wide angle designs. A shutter opening that is too small can also cause the lens to vignette, either with front mounting as above, or with regular mounting.

Sandy King
You are right a front mounted lens can get cut off by the shutter and vignette but only under very rare circumstances will a shutter vignette with a normal type mounting and only if if gets in the way of the lens or blocks the optics or some other rare circumstance. Perhaps a hypergon or a very long lens that is slowed down if f-opening by the shutter. These are rare circumstances but yes it can happen but not normally with regular lenses.