Noise: Exposure vs ISO?

Started 2 months ago | Questions thread
spike29 Senior Member • Posts: 2,179
Re: Noise: Exposure vs ISO? and Exposure compensation adjustment

something different:

every camera has a EV compensation which allows you to alter the measured outcome of exposure. like -1 is 1 stop underexposed.

often used for ETTR/ETTL corrections, zebrastripes option will help with that in highlights.

say i set iso fixed at 400 and i push my EV comp to +2EV (2 stops) and in order to keep shutterspeed at 1/125sec i need to open up aperture 2 stops.

or i underexpose by 2 stops (-2EV) so my shutterspeed is 2 stops faster.

which one generates more noise?

i think the latter because i have to raise shadows in post which is always a noise pull.

That's why exposure bracketing (-1.5; 0; +1.5) can give some interesting outcomes when you proces a rawfile

Only thing which i am not certain of is What is the "adjustment wheel" of EV compensation changing?  the actual meatering read of the sensor (sensitivity) or just a change of outcome of a meatering?

Or is it something which effects the ooc jpeg more then the rawfile?

(thinking further on that: is EV compensation in camera the same as EV compensation in post? when Raw is used?

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