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rscheffler wrote:
Edward, from my understanding, if there is consistent back focus at all distances, adding a shim to the lens should resolve the problem.
I think a factor working against you is it's a wide aperture telephoto lens compounded by the fact it's a Zeiss on a Leica body. As has been discussed/rumored before, the Zeiss Ikon flange distance was or may have been slightly different from Leica's. When I tried Andrew G's ZM85/2 on my M9 I was very surprised to find it focused accurately. Unfortunately this focus lottery seems to be part of the RF experience, and not saying this to make excuses for it... Of my lens collection right now, most don't focus perfectly on my M9 and each of those needs slight RF tweaks. Mental microfocusadjustment if you will... Curious now whether or not that would be much different with the M240.
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Hi Ron,
In theory, indeed, there is a difference between the Zeiss Ikon and Leica M flange distance. In practice, there are so many variations in lens calibrations, both from Zeiss and Leica, that buying a new lens is definitely like a lottery. I had to send my brand new 35/2 and 25/2.8 for calibration, but Zeiss did an excellent job with them. Unfortunately I think Zeiss tolerances are not sufficient for using the Sonnar on a digital body.
If the solution is that simple, I am sure the Leica technician will do it easily, especially that he's working with a Leica body not absolute numbers and measurements as in the factory.
Fingers crossed.
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