Does Lightroom pick up 6-bit code information from RAW file?

[tedd]

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So I'm yet to pick up my first digital Leica, but I am thinking about it a LOT and curious how Lightroom works with the 6-bit code system. If you only shoot RAW (which I do), does Lightroom pick up the lens info and automatically apply the correction? Or does the camera apply the correction before writing the RAW file? If none of your lenses are coded, can you simply tell the camera nothing and then select the correct lens in Lightroom and have it fix anything that needs fixing there?

Newbie questions I know, but I like to have things well and truly figured out before I jump in completely! Thanks!!

[jaapv]

Lightroom does nothing with the six-bit code except read camera-produced EXIF and sidecar files to recognize the lens.
The camera picks up the 6-bit code and uses it to apply in-camera corrections. It  writes the lens data into the file and EXIF for post-processing programs to use. You can also select the lens type in the camera menu with uncoded lenses.
You cannot make all corrections on the camera output of a non-selected lens - you will be missing out on the basic in-camera corrections. Lightroom lens corrections of M lenses are either minimal  (distortion) or non-existent.

[M11 for me]

Definitely Lightroom recognises your lens. I shoot only DNG and it behaves as with Canon: When ticking the field fir profile correction the image is immediately adapted

And it goes even further: When you crop your images in LR then the adapted angle of view is recognized as well and rendered in the exported pictures. I am always amazed when I view my images in Smugmug that it shows the "new" focal lengh in the Exifs. Great. And indeed the image was slightly croped as shown correctly.

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Edited February 25, 2020 by M10 for me

[pedaes]

4 minutes ago, M10 for me said:

Definitely Lightroom recognises your lens. I shoot only DNG and it behaves as with Canon: When ticking the field fir profile correction the image is immediately adapted

Agree the first sentence if you add 'and shows the information of lens model in EXIF data'. I do not agree anything else happens that is lens, not camera, specific . The camera profiles work with any lens, coded or not.

Edited February 25, 2020 by pedaes

[jaapv]

Cyan vignetting, for instance, is corrected in-camera before the raw file is written. Distortion correction is mostly done in Lightroom in a lens profile.  Lens (and sensor) corrections is something completely different from a camera profile in Lightroom. The last is applied during raw conversion in the post-processing program and is lens-independent.

[M11 for me]

vor 14 Minuten schrieb pedaes:

Agree the first sentence if you add 'and shows the information of lens model in EXIF data'. I do not agree anything else happens that is lens, not camera, specific . The camera profiles work with any lens, coded or not.

Thx pedaes. But I wonder if we talk of the same thing. Look at my sceen-shot (only part of screen actually) of the settings in Lightroom: How would LR recognise that information without the Code?

 

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[pedaes]

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3 hours ago, M10 for me said:

information without the Code?

Ok yes. Code to Exif, EXIF to LR I guess. If you manually select a lens in camera menu it shows in the LR lens profile as well.I have just checked a 50mm Zeiss Planar entered as a Summicron and it shows the selected Summicron in the lens profile.

[antonio-p]

On 2/25/2020 at 11:52 AM, jaapv said:

Cyan vignetting, for instance, is corrected in-camera before the raw file is written. Distortion correction is mostly done in Lightroom in a lens profile.  Lens (and sensor) corrections is something completely different from a camera profile in Lightroom. The last is applied during raw conversion in the post-processing program and is lens-independent.

Are you really sure that with the 6 bit code the vignetting correction is also applied to the DNG as well as to the on camera JPG?
I can't find any clarification on this topic written directly by Leica

[jaapv]

The instructions for the raw converter are written to the .XMP file. If you want a good explanation of DNG refer to Jeff Schewe: The Digital Negative. An older work, but still essential reading for any photographer who wants to understand the basics of digital photography.