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If I photograph the same subject, with the camera's automatic white balance, each with identical settings for the exposure, each time with the same (M) lens, once with the M10 / M10R and once with the SL2, the M image will be from both Lightroom and Capture One developed rather (too) warm and the SL2 image developed rather (too) cold. Leica has therefore opted for a completely different white balance for these two camera systems. The result of the SL2 images is a bit more sterile / digital. Even the "Pro-Profile" for the M10R advertised by Phase One leads to surprisingly unnatural, far too warm colors, at least for my taste. With the profiles, the RAW converters naturally have leeway in interpreting the RAW files, but in the end the results are unsatisfactory in my opinion. It is astonishing that Leica has obviously made a conscious decision against achieving a certain uniformity of the look between the systems. If there are third-party profiles somewhere that provide neutral and more comparable starting points between the systems for your own processing, that would be of great help to me.

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34 minutes ago, Ralf.Lange said:

 It is astonishing that Leica has obviously made a conscious decision against achieving a certain uniformity of the look between the systems. 

Leica clearly expected people to put the 'wrong lens' onto the SL but I don't think that means they should design the entire SL system around it. 

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1 hour ago, Ralf.Lange said:

If I photograph the same subject, with the camera's automatic white balance, each with identical settings for the exposure, each time with the same (M) lens, once with the M10 / M10R and once with the SL2, the M image will be from both Lightroom and Capture One developed rather (too) warm and the SL2 image developed rather (too) cold. Leica has therefore opted for a completely different white balance for these two camera systems. The result of the SL2 images is a bit more sterile / digital. Even the "Pro-Profile" for the M10R advertised by Phase One leads to surprisingly unnatural, far too warm colors, at least for my taste. With the profiles, the RAW converters naturally have leeway in interpreting the RAW files, but in the end the results are unsatisfactory in my opinion. It is astonishing that Leica has obviously made a conscious decision against achieving a certain uniformity of the look between the systems. If there are third-party profiles somewhere that provide neutral and more comparable starting points between the systems for your own processing, that would be of great help to me.

Automatic colour balance is just a starting point for postprocessing and set upon raw conversion. Raw converters don't just have leeway, raw converters set the colours.
What the camera makes of it is fairly irrelevant, it is the user who determines the outcome.
If you want it to be consistent profile your cameras in your postprocessing program using the X-rite Color Checker Passport as David suggests.  It won't take more than a few minutes per camera.

https://xritephoto.com/colorchecker-passport-photo2

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Thank you for your answers. Yes, every RAW converter converts the RAW files differently, but the camera does a white balance and saves it in the RAW file. And obviously warmer values are stored with a Leica M and cooler values with an SL. I will try it once with profiles I have created myself, but from what I have read about it here in the forum, I got the impression that there are many pitfalls and possible errors here. My aim is not to determine _ the_ "correct" value, but to get comparable results with both camera systems.

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There is no definitive 'correct' profile. You fine-tune your own calibrated profile to suit your perception. Save that as your personal profile for one particular camera. Load that when importing new files, and you have a better starting point. Remember, approximately 8% of men suffer from colour blindness. That means that one in twelve viewers on this forum see colours differently.

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No dangers and pitfalls here - it is as easy as falling off a log. Shoot the target under controlled lighting, I use sunlight and halogen, and drag the DNG into the Xrite software. The profile (either single or dual illuminant) will be created automatically and inserted into LR,PS or C1. If you wish, you can tweak as desired and save as a camera-specific preset.
If you do so for both cameras you will have your consistent starting point - provided the automatic colour balance does not get confused by colour casts in your subject matter...

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3 minutes ago, jaapv said:

... I would advise you to read this book ...

Great recommendation: I was afraid that you would recommend Margulis' book, which I would call "paint by the numbers". 😀 

Years ago, Bruce Fraser had a long discussion with Dan Margulis on their respective views. I much preferred Bruce's approach. 
________________________
Frog Leaping photobook

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Thanks for your help. The “problem” probably has little to do with color profiles, but primarily with white balance. I had bought a Colorchecker card and just created a profile for the M10R and a profile for the SL2. It was really very easy. Regardless of whether these profiles are better or worse than those of Lightroom or Capture One (they do not differ very much), they do not solve my main problem: the very significant difference, how the M10R and the SL2 carry out white balance, write the corresponding values in the RAW file, which are then read by Lightroom or Capture One and lead to completely different results (not between Lightroom and Capture One, the differences are rather small, but between the cameras). Regardless of the profile used, whether Adobe Standard or Adobe Color or a profile created by myself, the SL2 and the M10R are always clearly very different in color. If I then do an automatic white balance or a white balance using a gray card within Lightroom or Capture One, the results are mostly close to each other. So my "problem" remains: Leica has apparently tuned the two cameras completely differently and the only option is evidently to match the colors by means of a subsequent white balance or subsequent matching of the colors when taking pictures with the M10R and the SL2, for example, in a coherent project.

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Jaap gave one option. I always shoot "cloudy" like in the old film days so I can judge the light atmosphere afterwards.

The other option is to correct the white balance manually in the cooler direction. It will always be the same value. You will have to try out the right one.

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Use your greycard in a reference shot so that you can remove colour contamination with the eyedropper. Forget about WB settings, then. Just correct for a batch at a time. Easy! If you prefer your pictures warmer or cooler, just make the adjustment when tweaking your personal profiles. Where colour is important, I always take a shot with a reference greycard picture to aid post-production.

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