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I'm looking into the possibility of using Contax G lenses on a Leica SL camera (T-mount). It should be possible – there are such adapters (even auto-focus) for the Sony E-mount. Should be available for L (or T) Leica mount as well. I wouldn't mind using two adapters with something intermediate in between. Just trying to figure out which ones I need.

Tried to go through the Canon mount, bought two not realizing that Canon EOS M is not the same as Canon EOS. (I've never been a Canon shooter. Jumped from Nikon to Sony E, then to Leica-s – M and SL.) Turned out EOS M is for a mirrorless Canon camera, and there is no adapter to marry EOS M with the SLR version EOS.

Any other ideas I should consider?

  • ^ Are there 3D printers making stuff of metal (not fragile plastic)? – earlyadopter Jun 13 '18 at 15:43
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As you say, since Contax G → Sony E-mount focusing adapters do exist, so it's entirely possible to build one for Leica L-mount (SL/T). According to the Wikipedia table of flange distances, there's about 10mm to work with between the mount depths (Contax G=29mm vs. Leica L=19mm).

But, volume-wise the adapter makers probably don't find it worthwhile to make them, since mirrorless Leica owners are probably thin on the ground. And, unfortunately, since the Leica L mount is roughly the same depth (19mm vs. 18mm) as Sony E, you won't be able to find a Sony E → Leica L adapter. And the micro four-thirds and Fuji X ones might vignette (if they existed) since they're not for full frame.

You can't stack on an SLR lens adapter because you won't find Contax G → SLR adapters (just as you won't find them for Leica M), due to flange distances on SLR mounts being much thicker than Contax G.

I think you may have to find a custom service to convert the mount on the lens. Or just wait and see if someone does come out with an adapter. The main problem is that it's going to be very expensive if one does. The cost of the Sony adapters has been averaged out as they've already reverse-engineered the electronics of the focusing and then just been able to use that for additional adapters. Having to start over from scratch with an entirely different mount for low volume sales simply may not be worth the effort for Kipon or Metabones. And, making a low-cost ring isn't going to be worthwhile, if you want some way to focus the lens, given Contax G's lack of focus rings on the lenses.

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