New M240 user - Lens Profile Question

[pechelman]

Related to another post I made regarding the nokton 50mm / 1.5 VM, would the lens profile I select manually in the camera have any bearing on what I get in lightroom when shooting DNG only? In this case, specifically related to CA, but also asking in general.

Sometimes these lens profiles can be automagically applied on import, but not sure if that's how this feature works on the leica and LR. Also not sure if the lens profile I chose (summilux 50mm) would be the most appropriate one. Using the latest M firmware and LR6.

Any input would be appreciated!

Loving the M so far 🙂

 

[rscheffler]

The in-camera lens profiles only apply color shift and some vignetting correction, which is permanently baked into the DNG. They also add some EXIF data, such as lens focal length. The profiles do not apply CA or distortion correction. At 50mm, you're likely to see very little benefit from using a profile. The biggest difference may be relative to vignetting.

 

[jaapv]

As the purple fringing you refer to is not really correctable in a lens profile anyway, it being a combination of high edge contrast, longitudinal CA and demosaicing artefacts, the really simple solution is to use the defringe slider in LR. (or just about any other raw converter)

 

[pechelman]

gotcha. thanks guys.

the defringing slider is easy enough to use, but with the amount that I've been needing to dial in to remove it, I start getting other artifacts along other hard edges.

 

[Godfrey]

For the M-P, when using the Voigtländer Nokton 50mm f/1.5 ASPH (LTM), I set the lens code to 11891-11892 (Leica Summilux-M 50mm f/1.4). This way the lens information (name and focal length) and the working aperture setting estimate is embedded into the EXIF data. The raw data is suitably massaged per the specifics of the in-camera lens code.

In LR6.1, when I turn on Lens Corrections and profiles, LR applies the correction it has for that Summilux lens. This will change the rendering a little bit too.

You can also go into the Profiles panel and pick "Voigtländer", "Voigtländer Nokton 50/1.5" with the appropriate pop-up menus. You'll see the rendering change somewhat ... I notice that the corners/edges are affected as is the overall center to edge brightness by some bit .

The additional changes in either case are small—it's up to you to determine whether they are a benefit to your photo or not. For my photos, sometimes they are and sometimes it is inconsequential whether I use them or not.

If you want the Lens Corrections to be applied automatically on import:

1. pick any typical M typ 240 DNG file
2. go into Develop
3. turn on all the items in the Basic panel
4. use the Develop > Set Defaults menu command to establish that as the correct configuration to use for the camera on import.

To apply the corrections to all M typ 240 DNG files currently in your catalog that have not yet been edited:

1. create a smart collection to find all files that are DNG format, M (type 240) camera, and have no adjustments
   
   
2. click on the smart collection to enable it
3. use Edit > Select All
4. in the Quick Develop pane, click Reset All

enjoy,
G

 

[rscheffler]

Related to another post...

I didn't check your other post until now (it was late when I first posted). The CV 50/1.5 has a tendency to purple fringe fairly noticeably in high contrast transition areas, particularly at wider apertures. This is common with the faster Voigtlander lenses with which I have experience (21/1.8, 35/1.2 II, 50/1.5, 75/1.8). It's also the case with other brands, even high cost Leica lenses, though many of those better suppress purple fringing. A particularly notorious RF lens for purple fringing is the Zeiss ZM 85/2...