Joseph,
There are several adapters for Hasselblad lenses out there. I've ordered one myself and will be trying it out at some point. In general CF, CFE, CFi Hasselblad lenses work well on just about any medium format design (e.g. Mamiya/Phase and Contax) as they're of retrofocus design as well as have a focus helicoid built in. Naturally you're limited to stop down metering, manual focus, and need to lock open the leaf shutter if so fitted. Some of the Hasselblad lenses won't work either, notably the ones made for 1600/1000 cameras and a few of the wide bodies from what I've been told (never tried), as well as all of the newer H1/HD lenses.
For most Schneider/Rodenstock lenses (assuming you're talking the main line and not the ones designed specifically for something like the Mamiya/Phase One 645DF) - these are designed for use on view cameras and are short focus lenses. The upshot from that is most of the wide angle lenses that are desirable for use on an MF body lack sufficient back focus distance to be used on the 645D or other SLR medium format bodies (due to mirror interference). For longer focal lengths they could work but then you still need a means to focus, e.g. a focus rail with bellows. For this there are several (expensive) adapters out there from Cambo, Toyo, Horseman, and Silvestri. Take a look at the Cambo product sheet here:
http://www.cambo.com/Html/products_photo/Linkedfiles/english/download/Item38...t%20X2-Pro.pdf. These adapters are still quite useful but do have some limitations (e.g. can't focus infinity on all of the normal prime range). Good applications would be micro/macro work, product photography, and anything that requires minor movements for perspective and depth control in a studio. Currently none of them offer a mount for the Pentax 645D, and if they did there are limits to what the 645D can do *if* it has microlenses on the sensor (v. likely) as that severely limits the amount of movements you can make. Additionally you'll have to bear the costs of the lenses themselves, which average about $3000 for the "digital" designs. In the end at this point its not probably going to be economically practical or effective for many applications using the 645D from my viewpoint.
Note Pentax also offers a 67 lens to 645 adapter that will work on the 645D, which also retains some of the aperture control allowing aperture priority exposure. I'm betting that's the best/most economical bet to get MF glass on the 645D.
I've also seen adapters from fotodiox for Bronica (ETR mount I think) and Leica Visoflex. The Bronica is reasonable as you can probably get cheaper but v. high quality lenses. I don't see the practicality in the Visoflex adapter though.
Hope this helps ...
Originally posted by eyeguy There is much discussion about the legacy Pentax lenses on the 645D but does anyone have any thoughts on the use of Hasselblad/Schneider/Rodenstock or other lenses on this camera?
Joseph