Michael Fontana
pro member
.........
If you have square objects at varying distances from the lens, then it's very difficult to get them all to look square at the same time by using PS perspective controls from a single image, so you have to combine images or select and correct different planes separately and keep all the edges clean and everything looking natural. It's much easier just to use front rise when shooting up at such a structure and get it right in the camera.
Yep, correct!
As for resolution, a shifted 4/5 or 13 x 18 fits more than required for a A-3, 42 x 30 cm