Upload & Sell: On
I have a great collection of sharp Pentax 645 lenses that I use with adaptor and with Zork for shift. What does it mean that some of you are working on it? I am very insterested in adding tilt to shift with these pentax 645 lenses.
I'm corresponding with two of our colleagues on this Alternative forum who are currently trying to develop a P645 to M645 adapter. Based solely on register distance, it is theoretically possible, as the P645 register of 70.9mm is longer than the M645 register of 63.3mm, and so you should be able to arrange for the P645 lens to mount 7.6mm in front of the M645 body, or adapter.
Unfortunately, the P645 lens mount actually extends quite far into the body, and so interferes with the existing M645 gubbins. I discovered this when I attempted to graft a P645 body mount assembly onto a M645 extension tube 1, which would be close to the right geometry if you could simply replace the M645 flange assembly with that from the P645 - no go.
On the other hand, I think it might be possible to replace the M645 flange assembly on a Mirex M645 TS adapter with a P645 flange assembly. I'm not about to do this, as I'm quite happy with the M645 lenses I'm using. You might consider asking Mirex if they could produce a P645 version. On page 4 of Yakim's other current thread http://www.fredmiranda.com/forum/topic/743122, Michael Gordon describes how he obtained a custom OM mount on the small end of a Mirex TS adapter - maybe you could get them to try putting P645 on the big end.