With questions being raised about the Novoflex M to mFT adapter, I thought I'd measure the thickness of mine - how much the M lens sits forward of the G1 lens flange. Answer, in my case, is 8.28mm.
The standard for the Leica M is 27.8mm and the only information I've seen on mFT indicates their standard is 20mm.
That's a little surprising because if Leica lenses have been focussing at infinity while the distance scale is less than infinity, the lens is sitting too close to the camera so if the 20mm figure is correct, I'd expect the thickness of the adapter to be less than 7.8mm.
My lenses focus pretty much correctly at infinity.
If any of you have the means to measure the adapter thickness accurately, it would be interesting to know what your figure is.