Abstract: An optical gun sight having a central axis for a hand gun, shot gun and/or rifle having a firing axis and with the gun sight having an image erector system located generally at the focal plane of the gun sight and with the gun sight including adjustment means operative on the image erector system for selectively moving the image erector system in two tranverse directions which are in turn transverse to the central axis to provide calibration of the position of the image of the target relative to the firing axis of the hand gun, shot gun or rifle whereby compensation can be provided for the trajectory of the bullet to the target.