Quote Originally Posted by MattKing

Actually, if the circle of coverage is, indeed, a true circle, I think that the circle of coverage would have to be the diagonal of a 6x9cm rectangle, or at least 12.041 cm.

{its my damned training in physics and math - it goes weeks without being used, and then rears its ugly head at the most surprising moments }

Matt, 6x9 is a poor metric approximation to 2.25" x 3.25". There are a few 2x3 roll holders with gates longer than 3.25", e.g., the Suydam, which is 84 mm long. And there are some that are shorter, e.g., the Graflex RH-8. Bur a lens that covers 100 mm, and I mean covers, not illuminates, will put good image in the corners of all of them.