In Rz67 terms, it is less than a third of the frame, which is 70mm high in the vertical dimension, and 56mm high in the horizontal dimension. Still, for architectural correction, it may be enough to do the job. I have had 3 or 4 of the rz 75 shift lenses, it can be hard to find a good one. The main issue is 2 elements in one of the rear groups have a tendency for haze to develop between the cemented pair. Something to do with the adhesive used probably.