I did contact Conurus about providing an external box for his conversions so they could be used on another mount than canon. As it turns out his chip reverts to manual mode if it doesn't find a canon protocol when mounted and at that point the external aperture on the lens works. What one would have to do for those lenses is provide the power through the contacts on the non-canon mount or from an external source.
Sigma and Canon protocols are largely identical, the stabilization is different for sure and there may be other minimal differences but converting a canon lens to sigma is pretty trivial and maintains all the aperture and auto focus functionality.
I suspect the lens functionality resides in a single chip and could be removed from a camera and housed with a power supply to work with other mounts but it's something I'm completely in the dark about and not something I'm interested in pursuing.
I bought a Hartblei superrotator 55mm 4.5 on ebay this morning. The 55 was originally designed as a shift lens and has larger elements and a bigger image circle than the other hartblei lenses. It provides 12mm of shift. Like some others I'm interested in getting max dof and shift at shot time rather than using fusing in post.
That 24mm was sure an attractive option until the aperture issue came up. I looked at the Nikon and it probably could be converted as long as the external aperture ring works in manual mode all the time and not only when on the camera like the Contax N and 645.
A canon camera is not really an option for me as I already have quite a bit of minolta stuff and I'm seriously thinking of removing the aa filter which I don't believe can be done on a canon as 1/2 (the horizontal IIRC) of the AA serves as the coverglass on the sensor and is not easily removed (think of solvent baths!).
BTW that machinist had to rebuild the aperture lever inside the lens on a kiron 105mm conversion from FD to digital pentax.
Mike
Mike
You'd also have to reverse engineer the electrical instruction for aperture selection. If you were adventurous and owned a lathe, it's probably with the realm of possibility to get these to mount and operate on something else, but it would a lot easier and maybe less expensive in the long run to just buy a Canon body for these lenses.
As far as I know there are no EF Canon lenses that have a manual aperture control. You are right; the new 24II is a remarkable piece of glass and works just as well as a normal manual focus 24, as long as you don't need anything faster than 3.5 - and it's way sharper at 3.5 than the 24 1.4 is at 3.5, especially in the corners.
The Red video camera can use both the latest Nikon and Canon glass, so it can't be THAT hard to figure out the electronics. It's just that I've never heard of an individual trying it themselves. But really, how hard would it be to read all the combinations coming off the contacts to figure it all out. And there's the Conrus guy in Canada who does the fully functional Zeiss to Canon conversions retaining AF and AE all the way. I've thought of working this out myself, but, really, I'm too busy shooting and in post, but I have though about it.
Peter