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Message: <blockquote data-quote="jimalexander" data-source="post: 308274" data-attributes="member: 25235">WayneF"Nobody asked, probably nobody cares,  but technically, EV is only about the camera aperture / shutter speed combination (the dial settings), and its equivalent combinations.  Camera settings of f/1.0 at 1 second is EV 0, regardless of ISO or exposure.  "Not at all what i was taught in school.  at EV15 ISO 100, you have to stop down the aperture and the speed in some combination of 15 stops.  If ISO goes to 200 (1 stop) you have to take back a stop from either the aperture, shutter, or some equiv. combination.  you can cipher the right exposure at any ISO without having to guess beyond the aperture/shutter figures.Jim</blockquote>