Another technical question for the many of you who I am certain have a better handle on this than I apparently do.
We all know that the amount of light entering the lens is controlled via shutter speed and aperture. Most of us also remember that the 'speed' of film allowed the same amount of light to record the image on the film either slower or faster based on the ISO rating of the film.
Question 1. Now with digital sensors, the technical ISO adjustment allows us to compensate for the lack of film 'speed'. How does it do that... technically? What actually happens or is adjusted within the camera? Is it the sensitivity or density of image distributed on the sensor that gets changed by the ISO value....which is why it is more noisy?
Question 2. We also have an EV button on the top of the camera that let's us adjust the exposure to lighten or darken the recorded image, regardless of the A,S or ISO settings. I believe this adjustment actually affects the meter by changing shutter speeds in A priority for example...but why do that? is it an 'auto' way to do 'manual settings??
Or to put it more simply... how do the 4 variables (A,S,ISO,EV) work together to set the exposure? What has priotity etc.
My real question I guess is just what does the EV button do as it relates to the other 3...and when?
Dan (Nikon D800,V2,Sony HX400V,Lumix ZS40) "I don't read, I just look at pictures" - Andy Warhol