Is there a big difference in DOF as you change film or sensor sizes? I noticed a little bit when comparing 35mm to DX size sensor in my DX DSLR. But will there be a huge difference if I go to, say 6X4.5 or 6X7? Many times it's frustrating with the DSLR-you need to be 24mm or shorter to get a wide angle perspective. And sometimes it's too much DOF, even wide open.