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I'd strongly recommend that book that Jim posted a link to then.
Photography is all about getting exposure right, which mean letting the right amount of light into the camera. Too little light and the image is too dark, too much light and the image is too bright. Bright white with no detail means too much light is getting in and your image is overexposed. In this case, if the moon is small in the frame with a predominantly black sky your camera will meter more for the black meaning that white's will over expose. For moon pics I spot meter on the moon itself meaning that the moon should be properly exposed (you may have to tweak it slightly), it doesn't matter if the sky is underexposed as it's black anyway.
With regards to metering, cameras meter the light to achieve what is neutral grey. You can think of this as mid way between the whitest whites and the blackest blacks. If you have a black scene the camera will try to make this grey and so over expose the image, likewise if the scene is white it will try to make the white grey and underexpose the image.
Read that book, it will start to make more sense after that. |
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