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Grey level values watch

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    What do we mean by grey level values in images?


    The metering system in the camera will try to produce an 18% grey in every photograph you take (at 0EV anyway). Get a sheet of white paper, grey paper and black paper and go outside. Set your camera to stop metering and Aperture Priority and take a picture of each of sheets of paper individually with them filling most of the screen. You'll find that they come out pretty much the same shade of grey. This is why shooting things like weddings can be very tricky because you have to expose for both the black of the groom's suit and the white of the bride's dress. This is also why we have different metering systems on cameras like evaluative, spot, partial and centrally weighted metering so you can give the camera some idea as to how you want your image metered. I personally leave it on evaluative and dial in + or - EV when needed, or use metering lock and recompose the scene.
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