A light meter is an instrument or display inside your camera viewfinder and on your LCD read out that tells you if the amount of light reaching the sensor is correct for your exposure. The light meter takes into account all three exposure elements, shutter speed, ISO, and aperture settings.

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1. A light meter is an instrument or display inside your camera viewfinder and on your LCD read out that tells you if the amount of light reaching the sensor is correct for your exposure. The light meter takes into account all three exposure elements, shutter speed, ISO, and aperture settings.