I'm fancying a medium format SLR but I have some questions. I'm mostly leaning towards hasselblad 500cm: -Mechanical Shutter -Easy to find/repair bodies and lenses -Hold it's value because it is digital-forward -Small-ish. Oh and I plan on using a tripod so mirror shake isn't that much of a concern. I have flex's for walk-around handheld use but sometimes I want something a little shorter or a little longer. I just plan on getting a 120mm for now and then maybe I would add a 60mm/80mm or 150mm/180mm in the future. 60mm is the shortest I'd go and 180mm is the longest I'd go. 1. I like Square but sometimes I like rectangle; however I do not like cropping because I print full-frame. There is a 645 back, I see some on keh.com for reasonable prices. -Can these rotate? I assume not. -Is there a mask for the viewfinder? Or do you just visualize the 645? 645 isn't that big of a deal but it would add to the versatility. If I like 645 so much then I'd just get a 645 camera. 2. I like waist-level but sometimes, mostly for longer lenses, I prefer to eye-level. A prism would be a natural choice but it would probably add bulk/ more things to carry, be more difficult to focus, and compromise viewfinder coverage. I have two choices: rotate the camera and compose upside down or get a prism. I guess it also depends on how "fast" you need to work but.. -What is the coverage for the 90 degree prism? -I do not plan on getting the acute-matte screen, in the beginning, but would the prism make things difficult to focus for 120mm-180mm lenses? -Anyone prefer the waist for eye-level viewing when on a tripod? Just wondering. I feel that viewing things upside down aids in composition. 3. Is there a difference between WLF? I see that there are "late" ones on keh.com which go more than the non-late ones.