Hi-- If you prefer the 28mm PC, I would suggest looking for the f4 older
version (it is non-AI, but mine fits AI bodies easily, but it is a good idea to make sure that the body AI tab is not moved when mounting the lens - or bevel the edge of the barrel slightly where the tab hits), since it is sharper (the f3.5 isn't bad) off-axis. Use f11 for full shift with horizontal frame, f16-22 for full vertical. Use only very thin rim filters to avoid vignette. Meter on axis with all but F3 bodies. The newest version of the 35mm f2.8 PC is better, but not so useful. Hope this helps. David Ruether