one of the reasons why WLF are not really interesting for 645 (contax, mamiya, H1/2) is the simple fact that one can really only shoot horizontal...holding a camera sideways with a WLF is not really an option...the rollei 6008 system is af, can be fully automatic, has all ((multi/single spot, average, multizone) metering comes with a WLF, 45 prism or 90 prism (the meter is in the camera not he prisms) and accepts all imacon, sinar, eyelike/emotion and some phase backs....the backs rotate on the back just like filmbacks, so vertical/horizontal shooting is a matter of turning the back...there is no other system with these options/possibilities....the cameras accept pretty much all lenses ever made for the 6000 series (the older ones come with limited functionality...)....for simpler bodies (no af and less metering options), there are lots of options on ebay, where a 6008i with lens and back can be had for less then 1500...most of them accept all imacon, sinar and eyelike/emotion backs...