So, I have a chance to buy a Mamiya 645 1000S system. I got a chance to play with it last night, and I believe I am smitten. The body and lenses look to be immaculate. The standard lens is *the* one to have with this camera: the 80mm 1.9. It also comes with a wide angle lens (55mm 2.8), 2 film loaders (120/220), a complete close-up filter set, a Hoya circular polarizer and a couple other filters. There was also a prism viewfinder attachment, a camera grip, and an older but apparently functional Sunpak pro flash with associated bracket and cables. Plus, the very groovy steel case. Total package: $660. So, after playing with it all and running a test roll, I discovered the problem and I dont know how much it could cost to fix it. I really prefer using the prism viewfinder, so switching that with the waist level one was the first thing I did. But the mirror locks up when the shutter goes off. The meter was functional, bright viewing screen, just mirror lockup, regardless of settings. My husband talked to a Mamiya rep who said it sounded like to be a short in the prism viewfinder. I guess I can find another prism viewfinder, but by themselves I saw them listed for a couple hundred dollars..... So, at the moment I'm not sure what to do. Since none of the pictures turned out on the roll I ran last night because of the lockup, I will be able to test it again just using the waist level viewfinder tonight or this weekend. We know the seller and theres no pressure or hard sell involved here he just wants what he paid for it (although he didnt know the prism was non-functional). I guess my (long and rambling) point is: is the system still worth the money minus the prism finder? Its an important feature to me, just personal preference. Does anyone have experience with any repair places for something like that? I could use some feedback and input.