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Lens calibration


pragmatist

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From my own experience, local Leica shop can only calibrate old lens, 28mm Elmarit-M, 35mm Cron ASPH, 50mm Cron, 50mm Lux and M8, M9 but they cannot calibrate FLE lens, 50mm Lux ASPH and 35mm Lux ASPH. I had to sell my 50mm Lux ASPH to the shop and still keep my 35mm Lux FLE deciding to send it to Solms or trade it with the good calibrated one.

Edited by viboons
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:confused::confused:Did I get that right? Sell a lens because it needs focus adjustment? A bit weird if I may say so. Leica will adjust any lens to M8/9 standard.

You are correct that it is preferable to have FLE lenses adjusted by Leica themselves. They have the equipment and expertise. Normal lenses are just as well served -or sometimes even better- by reputed Leica repair shops.

 

I would urge you to search the forums. There are dozens of threads on the subject.

Edited by jaapv
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Think i read somewhere that it's good practice to send your M9 and favourite lens in for critical calibration.

 

Some people are under the false impression that Leica calibrates your lenses to "match" your specific body, which is absolutely false. Leica calibrates rangefinders and lenses to a standard, so that lenses and bodies are completely interchangeable with all the other bodies and lenses in the world. To do otherwise would be chaos, and would mean a return to the long retired practice of having bodies and lenses with matching serial numbers that could only be used together.

 

My apologies if your OP was just a suggestion to have your favorite equipment regularly checked, but I agree that "if it ain't broke then don't fix it..."

Edited by StephenPatterson
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Some people are under the false impression that Leica calibrates your lenses to "match" your specific body, which is absolutely false. Leica calibrates rangefinders and lenses to a standard, so that lenses and bodies are completely interchangeable with all the other bodies and lenses in the world. To do otherwise would be chaos, and would mean a return to the long retired practice of having bodies and lenses with matching serial numbers that could only be used together.

 

My apologies if your OP was just a suggestion to have your favorite equipment regularly checked, but I agree that "if it ain't broke then don't fix it..."

 

Calibrate to a standard makes perfect sense Stephen, that would mean each calibrated separately would give ideal calibration together. If not what does Leica do?

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:confused:.... Leica will adjust any lens to M8/9 standard......

I also believed this to be the case, but my dealer sent a 135mm Tele-Elmar lens to Solms this year for recalibration for use on an M9 and had it returned saying that it was not possible to recalibrate that lens. I later found another version which focused perfectly. Perhaps it has to do with original tolerances.

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No, that has to do with the mechanism. That lens is a dog to adjust, to put it mildly. If you have to have it done by Leica at their prices and overhead it is better to buy another one. I had mine done by Will van Manen, and he (although he does not like doing these lenses) got it spot-on.

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I also believed this to be the case, but my dealer sent a 135mm Tele-Elmar lens to Solms this year for recalibration for use on an M9 and had it returned saying that it was not possible to recalibrate that lens. I later found another version which focused perfectly. Perhaps it has to do with original tolerances.

 

That may be true of the last version (e46 filter, telescoping shade), but the earlier version is most definitely possible to recalibrate, credited to the fact the lens head is meant to unscrew for Visoflex use w/ a short focus mount. I did mine myself. At the rear of the lens head are male threads which screw into the focus mount, and beyond those threads is a flat landing about (If memory serves) 3mm wide. Depending on whether the lens needs to be positioned farther away from or nearer to the focal plane, that landing area must either be shimmed or milled-down, respectively. Mine required the latter, certainly the more difficult of the two, but with careful measurement and incremental progress I was able to nail it spot-on. After shimming or milling, the thread timing will be slightly different, so the aperture index/focus index/DOF scales will need to be re-aligned, which is a matter of loosening three very tiny grub screws, rotating the tube, and re-tightening the screws. If I could DIY it in an hour, then a Leica specialist with his specialist tools and experience should be able to do it in ten minutes.

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