EV (or exposure value) is an expression of what photographers call 'reciprocity.' In essence, at a particular EV, you can have any number of equivalent f/stop-shutter speed combinations that are all equivalent--in terms of the light that will get to the film. If you increase one EV you are increasing your exposure the equivalent of one f/stop (opening one f/stop) or halving the shutter speed (same difference). Keith D. Smith
i too need further clarification on this.... oddly i was stuck on this last night... the manual says (in the n80) exposure compensation to be in +/- half stop increments from the correct exposure as metered.. with 0 being the 'correct exposure'... question : is '+'opening the lens or closing? which implies '-' to be the opposite... whichever one it is, will that also apply in 'barcketing'?
"+" is more light, either wider aperture, or slower shutterspeed. "Plus one stop" would be changing from f11 to f8, for example, or changing from 1/250 sec. to 1/125 sec. Zero means "no change". "-" is less light, either smaller aperture, or faster shutterspeed. "Minus one stop" would be changing from f8 to f11, for example, or changing from 1/125 sec. to 1/250 sec. ---scott
"I am always doing that which I cannot do, in order that I may learn how to do it." Pablo Picasso
Based on plus being more and minus being less then, yes, plus means open the lens and minus means closing the lens. Where you may be confused is that opening a lens means using a smaller numbered f/stop and closing a lens means a higher numbered f/stop. And bracketing instructions are the same, i.e., plus one means opening up a stop--AKA increasing the exposure a stop or one EV. Keith D. Smith