Started Dec 20, 2013 | Questions thread
rhlpetrus Forum Pro • Posts: 24,890
Not ETTR necessarily Re: Why ETTR?

Ysbrand Galama wrote:

Can someone explain to me why I should expose to the right (ETTR) in low light conditions.

Let's take an example to explain what I do not understand. Let's say my camera measures F2.0, 1/50th and ISO 800 (no over- or under exposure). I want to ETTR so I set my camera to F2.0, 1/50th and ISO 1600.

Why would ISO 1600 give better results than ISO 800? I maybe exposing to the right, but also the sensor noise increases, negating the effect.

I must be missing something.


Using same SS and perture will produce same exposure on sensor, 1600 will only cause camera to amplify result before writing to RAW, if that's what it does (some do not change RAW). Why do you think increasing gain will mske it a "ETTR" exposure? Depending on the metering used it could produce a clipped RAW file. You need to study your camera's spotmeter and see how many EVs you have above centre calibration and clipping point in RAW. For that you need to do some testing and use a RAW analysing software, like RawDigger.

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