Patent ID: 7578091

Claim:
An actuator for adjusting a lead mark of a telescopic sight, wherein said actuator is in the form of a rotary knob mounted for rotation on said telescopic sight and, when said rotary knob is turned, the position of the lead mark displaced via an adjusting mechanism in the vertical and/or horizontal direction, and said rotary knob has one or more indexing elements, by means of which one or more positions of the lead mark can be indexed, and when said rotary knob is turned in an actuating mode the one or more indexing elements are entrained with said rotary knob and in an indexing mode the indexing elements are displaced, independently of said rotary knob, in a peripheral direction of said rotary knob, which rotary knob has one or more recesses in the peripheral direction at its lateral surface, wherein, in at least one recess there is mounted at least one indexing element for rotation in the peripheral direction, said one or more indexing elements being coupled in their recesses to said rotary knob in such a manner that they are entrained with said rotary knob when the latter is turned, wherein the external surface of said one or more indexing elements is offset from the lateral surface of said rotary knob in the direction of the axis of rotation of said rotary knob and said one or more indexing elements are permanently disposed and displaceable in said recesses.