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Your camera’s metering system plays a vital role in picture-taking. It works out how much light should enter the camera to make a correct exposure. It’s very clever, but it’s not completely foolproof. The problem with metering is that it takes an average reading – either of the entire frame or part of it, depending on which metering mode you’re in – and this reading is assumed to be a midtone, or in other words, halfway between white and black.
