Uploaded December 2024 | Updated September 2026, 1 hour ago
Deep-dive into how ISO works for log video in cameras. I highlight N-Log but the information applies to all log formats, including S-Log, C-Log, V-Log, etc... This is the first part of a series, where I hope to take the mystique out of log video and make it as easy to use as regular video.
0:00 - Introduction
0:37 - Photography exposure analogy
1:32 - Log ISO vs Sensor ISO
3:35 - Why Log uses a higher native ISO
7:07 - ISOs above native ISO
9:29 - ISOs below native ISO
10:10 - Why Log has more noise
11:53 - How Expanded ISOs work
17:27 - Overexposing Log (ETTR)
19:08 - Additional Technical Details
20:15 - Conclusion
Corrections:
08:46 - Note that although the BM cameras switch to the second gain level at ISO 1250, the actual native ISO levels for each gain level are ISO 400 and 3200. This means ISOs 100 through 320 and ISOs 1250 through 2500 are "expanded" ISOs, which I describe in the "ISOs below native ISO" section.
Deep-dive into how ISO works for log video in cameras. I highlight N-Log but the information applies to all log formats, including S-Log, C-Log, V-Log, etc... This is the first part of a series, where I hope to take the mystique out of log video and make it as easy to use as regular video.
0:00 - Introduction
0:37 - Photography exposure analogy
1:32 - Log ISO vs Sensor ISO
3:35 - Why Log uses a higher native ISO
7:07 - ISOs above native ISO
9:29 - ISOs below native ISO
10:10 - Why Log has more noise
11:53 - How Expanded ISOs work
17:27 - Overexposing Log (ETTR)
19:08 - Additional Technical Details
20:15 - Conclusion
Corrections:
08:46 - Note that although the BM cameras switch to the second gain level at ISO 1250, the actual native ISO levels for each gain level are ISO 400 and 3200. This means ISOs 100 through 320 and ISOs 1250 through 2500 are "expanded" ISOs, which I describe in the "ISOs below native ISO" section.
