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The Mirex gives +/- 15mm shift and 10 deg tilt. The Mirex rotates around the mount with 15 deg clickstops. If you're set up for side to side shift, then the Mirex tilts the lens up or down. The Mirex tilt movement is similar to front standard base tilt on a bellows camera, so you have to recompose the image after tilting. I generally use a Manfrotto 410 geared head (like the one Dennis shows) to make this easier.
The Mamiya 645 C 35/3.5 N, 45/2.8 N, and 55/2.8 N are all very sharp lenses. The Hasselblad CF 50/4 is a bit sharper wide open than the 45N and 55N, but these Mamiyas are equal or sharper at f/8 (centre and corners of 5D and 20D). I'd love to try the SMC Pentax-FA 645 35/3.5, but it's not a simple task to adapt the P645 to M645 - you need to modify the lens, as Mark Hubsand did with the one he tested.
From the Zoerk setup photos Dennis posted, it appears that the lens is mounted on the tripod, as opposed to the camera body (which is what you have to do with the Mirex). Mounting the lens on the tripod avoids shift-induced parallax for panos with relatively close subjects. In order to avoid this problem with the Mirex, I have to mount the camera body on a slider, so I can shift the lens one way, and then move the body back, to have the same pre- and post-shift positions for the lens with respect to the subject.
Despite the compromises, I really like the Mirex and use it with M645 lenses whenever I need some movements, but it really can't do very much in comparison with an old LF bellows camera.
Edited on Sep 07, 2008 at 08:25 PM