Actually the Mamiya 7, 7II (and the 6x6 "6") are like oversized Leica M-Series rangefinders - they have quite a few available lenses and accessories. The Mamiya 7 series has a 43mm which is about like a 20mm on a 35mm camera - David Hume Kennerly used only this lens for his book "Photo Du Jour". Still, a rangefinder is a different experience than an SLR.