Pre-asph summicron 90mm back focus

[defektive]

Hi Brian (& everyone else),
Is there a simple process for fixing the back focus I am experiencing with this lens on my M8?

Cheers,
Sam

[menos]

Hey Sam, I have a latest pre ASPH version of the 90 Summicron.
I found, that the lens indeed back focusses by about 1.5 − 2 cm in the close focus range, when shot wide open.

It works spot on though, when focussing from about 2m on.

I suppose, this is in the design of this particular lens and one has to compensate for example by slightly correcting focus or leaning back a bit after focussing, when shooting this close up.

Should your lens show mis-focussing at normal working distances for this wonderful portrait lens, you should check first your camera's RF and if in doubt, have the lens adjusted by a technician.

[Ben Z]

It's not in the design. Mine focused spot-on with my M8 and does with my M9 as well. Send the lens to Leica or DAG and tell them to adjust it to digital standards.