Wow, that video was clearly a labor of love, thank you, kind sir, for taking the time to create it and share it here with the community!
I'm curious as to how the data was attained and compiled for the headroom graphic for BM 6K Pro and G2 shown at the 8:14 Mark (image below)? If this was your handiwork I would be curious to see what those values might/would be for N-RAW in the Z6 III and Z8/Z9 and/or is determining this data something we mere mortals can do on our end(s)?
Many thanks! JG
Thanks Jimmy. The DR range info came directly from BM - they produce a chart with the info, which I used to craft an identical-looking chart from scratch so that I could animate potions for my video.
You can view their chart on page 55 of their manual for the camera:
I'm actually working to create my own DR tester, which I can use to generate the same info on other cameras like the Nikons.
Nice job animating that BM graphic, it'll sure be familiar shooting with those cameras. What is interesting to me is that in looking at the sudden shift at ISO 1250 one might think (as I initially did) that that value would indicate the second native ISO...which it does not. According to BM, the, er, "native" ISO's for those cameras are actually at 400 and 3200!
<<When the ISO setting is between 100 and 1,000 the native ISO of 400 is used as
a reference point. The ISO range between 1,250 and 25,600 uses the native ISO
of 3,200 as a reference.>> (Also from page 55 of your linked document.)
Further discussion on that graphic and BM's dual-gain implementation here from the kind folks at Frame Voyager (I have zero affiliation, link provided for educational purposes only)...
BMPCC6K Pro | DUAL NATIVE ISO & its effect On Dynamic Range - YouTube
So, onto Nikon's N-RAW and N-LOG, it's not clear to me that when the dual gain kicks in on Z9/Z8/Z6 III how it might differ from what Nikon might consider it's two, um, "native" ISO's, and whether their implementation of Dual-Gain(?) results in the same (or similar) progressive highlight/shadow headroom/floor shifts as BM reports.
My use-case here would be BIF against bright clouds and whether highlight headroom can be optimized by one's ISO choice. I.e. if Z6 III had the BM graph, then ISO 1000 would make better sense for preserving cloud details than 400 when shooting N-RAW/N-Log?
Dec 29, 2024 at 07:56 PM
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JG