That is awesome, looks great! I know you are using your FrankenCam with such a lens but do you see it being possible to adapt to a smaller footprint "Shift" adapter? I have the Kipon Eos - GFX Shift, do you think you could attach the lens somehow to this adapter? Thanks!
I'm using a stock, unmodified Toyo VX23D -- so no Frankencamera. The Master of Frankencameras is forum member Audii-Dudii, who has done amazing things with bits and pieces of his VX23D.
Let me start with a plan for using Mamiya G lenses directly on a GFX (so a "straight" adapter). No such adapter exists, of course. Therefore, I'm going to build using components that are all available on eBay:
- GFX to M65x1 adapter
- M65x1 focusing helicoid, 17-31mm
- M65x1 to M58x1 adapter ring
- K&F Concept Olympus OM to Canon EOS adapter
I'll screw the K&F Concept OM-EOS mount to the M65 to M58 ring, screw that ring into the helicoid, screw the helicoid into the M65 to GFX adapter, adjust the helicoid to set infinity focus, and then lock it down. Focus would then be by the lens; the only purpose for the helicoid is to make it easy to get the finished piece to the exact length needed for infinity focus. The inside will have to be treated to eliminate stray light that causes glare. I usually use telescope flocking, which I buy in sheets from Edmund Optical. I'll also have to mount a locking pin because the OM lenses had the lens release and lock mechanism in the lens; it's not on my converted lens (no room). All the parts can be purchased on eBay -- for just over $100 USD.
You might be wondering I'm using an OM-EOS adapter. I think I haven't supplied this link before, where I explain how I did the conversion. Here it is:
https://www.dpreview.com/forums/thread/4555617#forum-post-64867841 In a nutshell, there are no adapters for Mamiya G lenses, so you have to replace the mount with something else. You can use a threaded adapter, but I wanted a bayonet and had the parts on hand.
OK, now for your question. Tilt-shift adapters might be out. To get the lens on a tilt-shift adapter of some kind, you'd just have to figure out how to attach it using some combination of the kinds of bits and pieces I listed above. As far as I know there is no such thing as an EOS to GFX adapter. The only ones I've seen are for Pentax 645, Mamiya 645, Pentax 67 and Hasselblad. These all have flange distances much longer than the Mamiya G lenses. It
might be possible to hack one of these. For example, I've looked at the Mamiya 645 adapter and wondered about removing the Mamiya 645 mount part, machining the rim down, and attaching a replacement mount. I'm not sure the result would be short enough, and I'd worry about the projecting rear part of the Mamiya G 50/4, which sticks out 20.75mm beyond the flange. Its 35.96mm wide at the front. That's probably going to clash with the tilt-shift mechanism.
An EOS-GFX shift adapter is a whole other story. Canon EOS has a big throat, so that rear part might fit through. Will you be able to shift with that thing in the guts of the adapter? You'll have to figure out how to mount it, and you'll have to figure out how to fill the gap between the EOS flange distance (44mm) and the Mamiya G flange distance (which is 56.65mm using the Mamiya 6 mount, and a bit more using my OM mount, which is thinner. That's a simple machining problem if you can't use pre-made parts.
You can figure this all out in advance. Just build something out of cardboard and other materials to simulate the lens with its projecting rear end, and see what happens when it's in your adapter at the proper distance (which will be around 12.65mm in front of the face of the EOS mount).
Note that the
shutter is electric on Mamiya G lenses, which is why I had to have it locked open by a skilled technician. However, the
aperture is totally manual. Communication with the Mamiya 6 camera happened via levers.