How does EV step (compensation) work?

[iGBH]

I was reading through the manual for the D80 the other day and it mentions that when adjustments are made to EV compensation, neither the aperture or shutter speed changes.

From my limited understanding of photography I know that exposure is basically influenced by aperture size, shutter speed and ISO. So if exposure compensation does not change aperture or shutter speed does that mean it must alter the ISO to increase/decrease exposure? I don't think it does but i am not aware of any other way it could do it?

[Greg B]

I was reading through the manual for the D80 the other day and it mentions that when adjustments are made to EV compensation, neither the aperture or shutter speed changes.

From my limited understanding of photography I know that exposure is basically influenced by aperture size, shutter speed and ISO. So if exposure compensation does not change aperture or shutter speed does that mean it must alter the ISO to increase/decrease exposure? I don't think it does but i am not aware of any other way it could do it?

Hi iGBH.

What the manual actually says is that, in Manual mode the shutter speed and aperture aren't changed, just the exposure information in the electronic analogue exposure display is changed.

In the other modes such as Auto, Program, Aperture Priority or Shutter Priority, changes are made to aperture or shutter speed to give effect to the exposure compensation.

cheers

[iGBH]

Ok, thanks. That does make more sense.