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Leica M-D typ262 and 6-bit coding

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Does anyone know what exactly the 6-bit coding is doing in case of a Leica M-D 262? The camera records in DNG only and there is no way of manually assigning a lens profile in-camera. Is assigning a lens-profile in camera (like with a typ 240) the same as assigning it in Adobe LR afterwards?


Also, I was trying a Zeiss ZM 18mm but the sides shaded terribly and color shifted to blue/magenta. The same happened with a Voigtlander 15mm lens. I am wondering what the results will be with a 1980's uncoded Leitz Elmarit 28mm. I kind of liked the rendering of the Elmarit on the M6 in the days, but will it shift the color like the Zeiss/Voigtlander? Of course the 28 is not as wide as the 18 or 15mm's. Anyone experience with this? 

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If I remember prior discussions going back as far as the M8, the camera does use the profile information corresponding to what the 6-bit sensor detects to correct for high angles of incidence that light has when striking the sensor in the corners, especially with wide angle designs.  The 28, uncoded, may exhibit some shift, but of course, can be coded if you want the best performance.



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No, the in-camera 6-bit profiles are not the same as the lens correction menu in Lightroom and Photoshop.

Leica corrects for vignetting and colour shifts of the lens on the sensor, Adobe corrects for distortion and optical vignetting of specific lenses.


For third-party lenses try and find a setting that fits in the manual selection menu. This may well be for a lens of a different focal length as the lens you are attempting to correct. For instance, for your Zeiss 18 try the Elmarit 28 setting first, not the WATE one.

Trial and error!


If you are still not getting the result you want, you will have to rely on a Flat Field Correction plug-in in Lightroom or Photoshop. 

C1 has this useful feature built in.


The Leica Elmarit 28 has its own manual setting in your camera's menu which will correct it perfectly.

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M-D is nice but you'll have to try with all leica lens to ensure you don't go into that buyer's remorseful mode



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I have an M-D and all of my lenses are coded, apart from quite old ones from the 50ies and earlier. The M-D is certainly not the camera to try out profiles 

 , but there are other 240 Leicas out in the wild.


To your lenses:


If I recall correctly, I coded mine as a Super Elmar 18, which worked well on the M8 and M9. I think the 4/18 came in two different lens flange variations, bringing up different frame sets. Mine was the 50/75 model, the other one being probably the 28/90. I cannot confirm the latter flange works with the Super-Elmar-18 coding.


The Voigtländer 15 (LTM) version I did code as Elmarit 21, which as well worked good enough on both cameras. The latest Voigtländer 15 is reported to not have the colour shifts anymore, but I have no experience myself.


Edit :- one more thing: There is a software called Cornerfix. After profiling, it adds another step in the workflow, but does a decent job in removing vignette and colour shift.

Edited by Photon42

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Many thanks to you all. Lots of useful information here. For the moment I forget about using that 15mm on my M-D and restrict its use to analog photography. And when I get that 28mm again I will decide whether I'll have it properly coded or not. 

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