Aerocolor
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sfogg wrote:
I have the Voigtlander adatpter, it doesn't actually use the full length of the inner mount. In some places there is about a 1.25mm from the edge of the insider of the mount (where the electrical contacts would be) to the edge of the helicoid. Certainly not a lot of room but might be doable.
Yep, it would be sporty for sure. And with the FE-LM helicoids only having ~5mm of travel anyway, giving up a couple mm could quickly reduce the throw to below the TAP's sliding mount, which obviously wouldn't be favorable... It could probably be done, but I'm not sure it would be worthwhile for the M mount.
sfogg wrote:
If you want this to be usable with multiple lens mounts you aren't going to gain much helicoid length.
I think you're perhaps trying to cover all of the cases, when I was proposing something with more explicit limitations in exchange for other strengths. Having a longer throw is only a secondary benefit - the primary point is to eliminate the wobble.
Having the EF mount means that, without any corrective optics, you can easily use Canon EF, Nikon F, Pentax K, M42, Contax/Yashica CY, Olympus OM, Exacta, and Leica R lenses, among others, plus anything third-party available in T-mount or Adaptall variants. That's not everything, but it certainly covers a large chunk of what the average person has, or is likely to find in their local camera shop, garage sale, or antique store.
And as I mentioned, other non-compatible mounts become possible via some small (not anywhere near 10mm) fudging of the adapters collapsed EF-mount distance. For example, consider the 0.75mm-thick EdMika EF-FD adapter. If the helicoid focused just 2.75mm short of the EF's normal 44mm, then FD lenses using this adapter become directly compatible without any corrective optics.
sfogg wrote:
As far as AF, we do not know what the current capacities of the mount are. It was built for IF lenses. It might not be able to supply enough current to move this greater mass (a helicoid system is going to have more mass) in the same amount of time, it might not. You can't just gear it up if you can't supply enough current for the motor. Putting more massive lenses on the mount is just going to make that worse.
... Or we give it its own separate battery, and make it focus even faster than anything camera-powered could ever dream about.  .
This is just a "what-if" academic side discussion anyway, no reason to impose any unnecessary limitations. Just say "Camera battery drain issue resolved.", and call it a feature! 
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