Ursa 4.6k G2 middle gray placements

Just got the beast, and I'm looking at the chart for highlights versus shadows relative to middle gray. It looks odd to me.

ISO 200 has 3.9 stops above MG, 10.8 under?

Given that "middle gray" is about Zone IV in the Adam's system, and in everything else, why nearly 11 stops below that?

For a camera supposedly so good with high dynamic range and highlight control, you don't even get to about even distribution until ISO 2000.

I'd love some education on planning exposure with this camera. And note, I've been using incident and spot meters and flash meters for 40 some years professionally. I want solid technical advice.

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See page 37 of this manual.
https://documents.blackmagicdesign.com/ ... 1714810000

See page 37 of this manual.
https://documents.blackmagicdesign.com/ ... 1714810000

He obviously already has that information.

That camera should be exposed for and set at ISO 800, not 200. You should see a different distribution of stops above and below middle grey.

Is ISO 800 the native ISO?

That’s my understanding. It is ISO 800 on the URSA Mini 4.6K and I thought that rating was continued with the Pro versions of the 4.6K sensors.

See page 37 of this manual.
https://documents.blackmagicdesign.com/ ... 1714810000

He obviously already has that information.

Well good if he did coz he only said chart. There are other charts in the wild and I don’t know what he was referring to specifically. Glad you can read minds (or between the lines). moving on…

Those are clearly the specific numbers from the chart in the manual. Like, duh?

Thanks to Ric for adding at least a useful suggestion. Though I would love any further, technically sound information and advice from the users here.

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Consider for a moment that the aspirational 15 stops listed in the manual are more like 13+. The “native” ISO of 800 is more realistically like 6 over, 7+ under. For digital cameras stops above middle grey are easily defined, below mid grey it’s more subjective.

Good Luck

Thanks, Howard. Yea, I never assume the outer listed capabilities are perhaps as usable as one might prefer. Test everything, right?

It just seems weird that so much of the data is supposedly below MG. Compared to that above.

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