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Old Apr 7, 2004, 5:28 PM   #1
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Default Need help undestanding exposure adjustments (EV)

I have a sony digital camera. It has a exposure adjustment setting, It goes from -2EV to +2EV in 1/3 increments.

Could someone please explain in what conditions should I use what setting, examples would be greatly appreciated.

When to use positive EV and negative EV.
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Old Apr 7, 2004, 5:36 PM   #2
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You need to know what to recognize as a neutral tone first, then you can adjust accordingly. Your camera's meter will always try to make an image 18% gray. For instance, if you were to take a picture of a piece of white paper without exposure compensation, when you printed it out it would be a neutral tone. Conversely, if you took a picture of a totally black piece of paper, the camera's meter would adjust so that it was neutral. Real life example, if you're taking a picture of someone skiing in the snow, you would have to add exposure so that the snow was white. If you took a picture of a black cat in the shadows, you would have to decrease the exposure to capture the cat as black. This isn't something that can be adequately explained in a paragraph or two. I recommend that you do a bit of reading on exposure. Suggested starting place: http://luminous-landscape.com/tutori...exposure.shtml
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Old Apr 7, 2004, 5:45 PM   #3
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EV stands for Exposure Value, which is a measure of how much light is in the picture. The camera's internal metering system uses this value to calculate the proper exposure (exposure meaning the combination of aperture and shutter)
If the internal metering is not giving you the result you want, you can use exposure compensation (the function you're asking about)to correct it
If your camera is consistently over-exposing something in a particular situation, such as when there is a dark background and the subject is bright, you can use negative EV. (1 EV value is equivalent to 1 f-stop) On the other hand, if your subject keeps coming out too dark, a positive EV compensation will expose it more to make things brighter.
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