I dearly love my Mamiya 7ii, and am now the proud owner of a brand-spanking-new 50mm lens for her. I have been unable to find any MTF charts for this lens, and was curious as to exactly where diffraction starts to set in... trying to come up with a reasonable guestimate of the sharpness trade-offs in the smaller apertures of diffraction vs. depth-of-field for tripod-mounted landscape shots. Assuming adequate depth of field, where will I maximize resolution, and is f/22 still going to give me a solid resolution if I need it? (understand that I am used to Canon WA lenses that rapidly fall apart past f/16).
Here is a completely unrelated photograph of my lovely wife using the 80mm lens wide open on HP5+, just because I figured I'd include a picture for my first post.