For the third time in a month, I've strained my back so I'm at home today takiing Advil and considering having a few slugs of Crown Royal. Of course, when I'm idle, my mind starts to wander and photographic subjects come up. One of my current fantasies is buying a used Hasselblad outfit since the prices are so low right now I can almost justify it. My purpose is for very light shooting, usually on a tripod, never with a flash and the subject matter is whatever catches my fancy. I don't need a lot of lenses, prism finders or a half dozen backs to do this. I'm thinking of a body, 120 back, waist-level finder, 80mm and, maybe, a 50mm. Recommendations I've gotten are to get a 500C/M or later model with the rapid winding crank and an Accumatte screen. In lenses, the CF models are said to have good parts availability whereas the older lenses may not. In looking at the KEH website, I'm a little confused over the differences in some camera bodies and camera backs. I know that some of the more recent bodies have TTL flash capability. I'm not interested in that feature. What's the difference in the 500C/M, 501C, 501C/M, 503CW, 503CX and 503CXi other than the flash features? I know all the backs fit all the bodies and the 6x6 format backs are the "12" series. What is the difference between the 12, A12, A12 with Black Dot Release and the A12 with 12 Release. The A12 with dark slide holder seems pretty self-explanatory to me.