MIRRORLESS: Lumix GH6: what is base ISO?

[Ron Evans]

Do you really need DR boost on ? Have you tried to see the difference with it on and off for the scenes you shoot ? If it is off then you can turn down the ISO all the way to 250 or 125 with extended ISO. To me Vlog is more important. My shoots in dark theatre do benefit from DR boost ON but then I do need the ISO at 2000. !!!

Depends also on your output format. If you are using rec709 you may not notice a big difference. Test with HLG if the difference is negligible to your eyes turn off DR boost and life will be simpler.

 

[Peter C.]

Do you really need DR boost on ? Have you tried to see the difference with it on and off for the scenes you shoot ? If it is off then you can turn down the ISO all the way to 250 or 125 with extended ISO. To me Vlog is more important. My shoots in dark theatre do benefit from DR boost ON but then I do need the ISO at 2000. !!!

Depends also on your output format. If you are using rec709 you may not notice a big difference. Test with HLG if the difference is negligible to your eyes turn off DR boost and life will be simpler.

That was my point. To put things in perspective under sunlight DR from highlight to shadow is around 19 stops, humans can perceive 14, cameras make wild claims but realistically around 10 so whether you can squeeze out half to 1 extra stop of DR is relatively small. It's not to say there isn't a difference, but to what lengths is reasonable to achieve that gain? Filming real word tests instead of relying on numbers and specs is sometimes more useful. Does it pass the eye test?

 

[JeffD7K]

Like I said generally the down side of using lower iso below base iso results in less dynamic range in the highlights. Since recovering highlights is more useful shooting outside that’s why Bob is recommended 800 iso with variable ND to lower the exposure instead of lowering the iso.

It is my opinion for doc work I can’t be bothered to do any of this to get a relatively small advantage in DR.

Most important thing said in this discussion. If you are not making a movie, but are a documentary film maker, use something like natural. You will be less engaged in technical and more engaged in telling the story, people being interviewed will be less nervous because you can basically point and shoot.