I've been searching the Internets with no success. Can anybody, please, help me with this: How much coverage/ image circle do I need for a lens with Graflex Crown Graphic so that I can use all the movements the camera provides? The only info I can find (and can also demonstrate) is that e.g. f4.7 Xenar 135mm allows no movement and --say-- f4.7 Optar 135mm allows "some movement". I also know, that 4x5 without movements needs 6.5 inches (165mm) to barely cover 4x5 with no movements. But, how many inches / mm do I need to cover the 4x5 of my Graflex AND handle the movements the camera provides? 200? 250? I could the use e.g. this to find a suitable lens.