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In photography, sidelight is understood to be a light situation (see lighting ) in which the subject is illuminated from the right or left, viewed in the direction of the camera.

One-sided side light leads to high contrasts between the side of the subject facing the light and the side facing away from the light. A brightener may be required for the shadow side in order to keep the subject contrasts within the reproducible range of the density range of the film or sensor.