Why expose ETTR and how to do it?

Started 4 months ago | Discussions thread
SrMi
SrMi Senior Member • Posts: 1,679
Re: Why expose ETTR and how to do it?

Erik Kaffehr wrote:

<snip>

Nice summary, thanks.

There is no big reason to overdo ETTR. Most cameras have pretty good SNR at base ISO.

What does "good SNR at base ISO" mean?

I assume that you meant that most cameras have at base ISO large enough DR  (max. signal to noise "distance") so that losing a bit of DR due to underexposure is not a biggie.

On a camera with a Sony sensor, it may not be a great idea to increase ISO get more ETTR exposure. ETTR is about exposure, not ISO.

Dual gain sensors have kind of two base ISOs. Jim Kasson wrote how to optimize for that by increasing ISO in discrete steps.

Cheers,

- Srdjan

Best regards

Erik

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