Quote Originally Posted by Tom Stanworth
If you are using a 35mm lens at f22 for a landcsape, diffraction will limit your resolution somewhat.
I have never seen a 35mm lens - we ARE talking about true focal length - not "retro" - that would stop down to f/22 ... that is a *very* small - in terms of physical aperture - diameter. Lens makers do not *WANT* to have their product subjected to the possibility of degradation by diffraction.... so f/16 is the lower limit.