I've an odd desire to play with MF photography (I wonder why?) but I've no idea what I'm doing.
I see Pentax 645 bodies for cheap (they are quite old, after all) and they look like a nice way to get my feet wet.
So, is an old 645 worth getting? (They go for about $300.) And what is the "crop factor" of 6x4.5? .6?
Course this will probably end up being the better part of the cost of a 30D.