Lightroom Classic: Sigma FP CinemaDNGs big problems

  • 1
  • Problem
  • Updated 4 months ago
  • (Edited)
My workflow is to capture with my Sigma FP in Sigma's CinemaDNG format at 23.98fps. I then import the files into Lightroom Classic where I can use the tools to set my color and then export 16-bit tiffs for image sequences. 

When importing into LR, I directly import about 300 DNGs. I have a problem where the image shown by Lightroom does not reflect the actual image. The Lightroom Images will appear out of order. When I open the image directly from LR into PS, the images do not match. 

To test if there was anything corrupt with the DNG files created by the camera, I imported all fo the DNGs as an image sequence into After Effects. I also opened all of the files directly in Photoshop. The images all matched. 

I know that the Sigma FP had a problem when it first came out with images being out of order. My Sigma FP is running the newest firmware which Sigma says corrected the problem. 

PROBLEM: When importing a sequence of DNGs shot close together (23.98 fps) into Lightroom, Lightroom does not represent the images correctly within the program. If opening the file directly from LR to Photoshop, the image in LR will not match the PS image. After testing, the image in LR was incorrect and the image in PS was correct.  


LR 9.1 Camera RAW 12.1
Photo of Josh T

Josh T

  • 3 Posts
  • 0 Reply Likes

Posted 5 months ago

  • 1
Photo of Rikk Flohr

Rikk Flohr, Official Rep

  • 7717 Posts
  • 1780 Reply Likes
If the image in Develop module doesn't match Photoshop that likely speaks to a Monitor Profile issue.  Examples would help diagnose this.

As for your sort order, if the shots are < 1 second apart you can switch to Filename sort order to restore the as shot order - unless you haven't named your shots that way. 
Photo of Josh T

Josh T

  • 3 Posts
  • 0 Reply Likes
Hi Rikk, 

Thank you for taking the time to reply. 

When I say that the image does not match, I do not mean there is a color shift or a slight difference to the image. The image in every module, Library, Develop, Print, is visually another image, the incorrect image. If I open from LR directly into Photoshop, another image (the correct image) is shown.

To test if it was an issue with the file itself, I took the DNGs into After Effects and opened them as an image sequence and there was no problem with the order of the sequence. I also imported the Capture DNGs into LR and immediately exported them as new DNGs. I then imported the newly created DNGs into LR and the problem went away, the images were correctly ordered. 

Also I tested the file name sort order and this did not solve the problem.

The files that I was working on are for a commercial client so I cannot share them, however, I will try to shoot a few tests this week to better illustrate the glitch. I am hoping to test on a few more computers to eliminate an OS problem.  

When reading metadata, what is the smallest increment of time Lightroom can recognize? 

Best,
Josh











 
Photo of Rikk Flohr

Rikk Flohr, Official Rep

  • 7717 Posts
  • 1780 Reply Likes
Recommendation: 

A Preference File will survive a Lightroom uninstall/reinstall. Sometimes weird behavior is corrected/cured by resetting the preferences.

Reset Procedure:

1. Close Lightroom.
2. Hold down [Alt/Opt]+[Shift] while restarting Lightroom.
3. Overwrite the Preferences when prompted by the dialog.
4. Close Lightroom.
5. Restart Lightroom.

Does the wrong image issue continue after resetting the preferences?
Photo of Андрей Армягов

Андрей Армягов

  • 1 Post
  • 0 Reply Likes
I have a similar problem with Sigma FP and LR. LR creates a false preview of the frame that is not true. There is no such problem in C1pro.