Z8 HLG / SDR Tone Mode RAW File comparison

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Andy Miller Photo UK

Andy Miller Photo UK - Nikon/Hasselblad shooter
Supporting Member
@Andy Miller Photo UK

if you look at the video Steve posted you'll see the shadow areas were significantly impacted in an adverse way.

I obviously watched Steve vid too quickly -- I thought it was a comparison of the HEIF and JPG -- but NO it was of RAW files and based on my test and Steves analysis I am reminded Nothing is For Free -- YES stick with SDR

I simply do not understand why the RAW data is impacted by this choice.

I do not use NX Studio - but I do use Capture One and LRC -- Thom Hogan's initial thoughts are C1 does not yet know what to do with HLG. I wonder if LRC/ACR does either.

More testing is needed - but for now I will follow Steves advice -- keep it in SDR which gives great predictable results.
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John Navitsky

Well-known member
I simply do not understand why the RAW data is impacted

More testing is needed
i don't think any of us do. the one thing i'm clinging on is that one thing i read is that they use the curves to control the allocation of data in the raw file, then they use the inverse of that curve when showing the data. if i'm following that correctly it could suggest you could end up with different raw file sizes for essentially the same visible result because it's allocating more data space to certain parts of the curves (or something like that).


Staff member
Supporting Member
Thread starter
Why when shooting Lossless RAW would one not always use HLG?
I tend to think along the same lines as John - they may be actually be distributing the RAW data differently (more efficiently) in the HLG version. We might not see it yet simply because there's not a lot of software fully supporting it. (although, just guessing).

Also, aside from the noise issue I spotted, you're also stuck at ISO 400 for your minimum. Not always an issue, especially for wildlife shooters, but I still sometimes shoot lower ISOs and would like access to them :)