Im interested in shooting some 645 orientation with my 503CW. Also like the idea of getting 4 extra shots per roll. If I purchase the A16, what are my masking options for the focusing screen? Also I am curious whether or not I can use my PM prism finder with this back or am I limited to my WLF? I assume its probably going to be difficult to shoot vertical portraits with the A16? I would like the option, but most likely use primarily for landscape shots…
Any help would be greatly appreciated!