I believe it will cover 4x5" at infinity with no movements but has been computed for shorter working distances. I see Tominon lenses advertised on e-bay and elsewhere as LF macro lenses. If you're going to play with this lens, try it at a 1:1 repro ratio (i.e. life size or bigger, bellows extension 270 mm or more) on an 8x10" (I assume from your name that you have one).