Abstract: A variable power telescopic gunsight is shown with an automatic correction factor for elevation and/or drift. As the magnification is adjusted by a rotatable means on the gunsight which typically moves a pair of lens in response to camming action, a third longitudinal movement is provided in the gunsight in response to the rotation with appropriate camming surfaces to compensate for normal drop of the bullet by providing elevation of line of sight of the scope up or down. The same rotation action used to change the magnification can provide another longitudinal movement of another camming surface to compensate for drift by changing the line of sight of the scope to the right or left.