Backfocus on Leica Summicron 90 pre-A E55

[Infantasy]

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I recently confirmed my Summicron 90 has backfocus problem. Since my M9 used a few years ago, I adjust the focusing cam on the camera to overcome the backfocus as I thought that there should not be the lense problem. However, the problem still exist after I changed to a M10 and later the current M10-P, both are brand new, I can’t excuse the problem is come from the lense. Although I am currently using the EVF to overcome, I would like to adjust the lense myself to make it accurate when using RF focusing. Does anybody can show me how to adjust. Thanks in advance.

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[Fgcm]

Lenses are not easy to adjust. You need a set of shims made by Leica and some tools nor readily available from Amazon or the hardware store.

if I were in your shoes, I wood send the lens either to Leica or to a reputed specialist who will adjust your lens properly.

[Gregm61]

Bought a like-new in the box, pre-ASPH, Canadian-made 90mm f2 Summicron from the mid-80’s 3 years or so ago, sent it to Leica and had it 6 bit coded, and it has focused perfectly on 3 digital M bodies ever since.

It’s worth the cost having some things done by those who know what they’re doing.

Edited November 2, 2019 by Gregm61

[lct]

My 90/2 v3 did misfocus on digital as well but not my v2 for some reason. V3 was calibrated by Leica while doing 6-bit coding and the lens is spot on since then. Those lenses are close to the limits of the RF accuracy at full aperture so i would not try to adjust them myself in any way.

[Infantasy]

5 hours ago, lct said:

My 90/2 v3 did misfocus on digital as well but not my v2 for some reason. V3 was calibrated by Leica while doing 6-bit coding and the lens is spot on since then. Those lenses are close to the limits of the RF accuracy at full aperture so i would not try to adjust them myself in any way.

How much did you pay for the calibration? And how long did they return the lense to you? Thanks 

[lct]

1 hour ago, Infantasy said:

How much did you pay for the calibration? And how long did they return the lense to you? Thanks 

Was several years ago. Better ask Leica or a good workshop for a quote now.

[Exodies]

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Leica adjusted my Summicron 90 this April for 262€. The rangefinder images wouldn’t overlap at infinity. Took two or three weeks.

Edited November 3, 2019 by Exodies