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Forum: Troubleshooting and Beginner Help
11-15-2014, 07:13 AM
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I may be interpreting your question a little differently, but yes, it corresponds to a specific adjustment. A change of +1 EV corresponds to opening up the aperture 1 stop to make the picture brighter (or opening the Aperture and raising the ISO a combined amount of 1 stop if you've got Auto-iso turned on).
For example, suppose you're in Shutter Priority and Manual ISO, EV comp set to 0 and your camera reads:
1/250 f/8 ISO 200
If you set EV to +1/2 and change nothing else (including framing, metering mode, etc.) your camera will now be set to:
1/250 f/6.7 ISO 200
If you set EV to +1 and change nothing else (including framing, metering mode, etc.) your camera will now be set to:
1/250 f/5.6 ISO 200
If you set EV to +1 and also turned Auto ISO on (but left framing, metering, etc alone), you'd get one of the following:
1/250 f/5.6 ISO 200
1/250 f/6.7 ISO 280
1/250 f/8 ISO 400
Depending on what the camera thought was the best choice. Trying to predict what the camera will do when it has control over 2 variables can be tricky (as Dave has talked about above), and if where one or both these variables land is important to what you're doing it's best to just take control over them in some way, shoot in TAv mode, or set limits on what Auto-ISO is allowed to pick, and so on.
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