ProResRAW: S-Log3/S-Gamut3.cine LUT underexposing at 12800 ISO

[TorbenMayer1]

Apple Feedback Assistant ID: FB13631126

DESCRIBE THE BUG:
The S-Log3/S-Gmaut3.cine LUT is underexposing the image when the codec is ProResRAW (in my case from an A7SIII).
The same video file taken from the camera (XAVCS-I) is working fine.

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TO REPRODUCE:
Shoot ProResRAW on an A7SIII ; settings for camera and Atomos Ninja V are S-Log3/S-Gamut3.Cine
Set the camera to ISO 12800
Import to ProResRAW footage to Final Cut Pro, select the matching LUT (make sure to select the .cine LUT).

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EXPECTED BEHAVIOUR:
Normal LUT conversion, should have brightness similar to the normal S-Log3/S-Gamut3.cine LUT.

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SCREENSHOTS:

Screenshot 1: Expected behavior (using the S-Log3/S-Gamut3.cine LUT)

Screenshot 2: Actual behavior with the correct LUT applied, the image is several steps to dark.

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SPECS:

• 2023 Mac Studio (M2 Pro, 32GB RAM, 512GB SSD)
• macOS Sonoma 14.3.1
• Final Cut Pro 10.7.1