Hello, I'm looking for the best choice in choosing a wide-angle lens for my Mamiya 645. I'm not specially looking for ultra-wide format like 35mm. 45, 50 and possibly 55 would be fine, but first and foremost, i'm looking for the best performances (sharpness, contrast), even in the corners, and for a reasonable price (<300 USD). So after numerous readings, the following lenses seems like beeing good choices : - Mamiya 45mm f/2.8 S/N - Mamiya 55mm f/2.8 S/N - Flektogon 50mm f/4 MC CZJ (pentacon 6 mount) - MIR-26V 45mm f/3.5 Would you have an advice to help in this choice ? NB : the following article seems to pretend that MIR-26 is over the Flektogon... http://www.rickdenney.com/mother_lens_test.htm However, I've read on this article that pentax 645 lenses could be mounted on mamiya 645, which seems strange to me as I've always read elsewhere that it was not possible : http://slrlensreview.com/web/mamiya...-159/471-mamiya-645-45mm-f28-lens-review.html would you have an idea about this ? Thanks a lot for your help !