hello, luminous landscape! i am advanced amateur and have nikon d700 + olympus e-p1. In near future i want to switch to "low-cost" medium format camera MAMIYA dm22 for larger prints. can anyone tell me is it better then top-cameras from nikon and canon, like d3x and 1ds mark III? What would be the best choice for tripod-landscape photo? i`ve heard about long expouse problems on MAMIYA...is it true?