Device for Establishing or Releasing a Coupling

A telescopic sight comprising:

• an optical element;
• an adjustment ring;
• a cylindrical index ring;
• a base element;
• an adjustment shaft;
• a detent mechanism;
• a friction element;
• a first pressure element;
• and
• a second pressure element;
• wherein
• the adjustment ring is rotated on the base element by way of the detent mechanism,
• the cylindrical index ring is inserted between the adjustment ring and the base element so as to rotate in relation to an index mark provided on the base element,
• the adjustment shaft is connected to the adjustment ring and is used to adjust, through the base element, the optical element,
• an inwardly directed ring surface is integrally formed on an edge of the index ring pointing toward the adjustment ring,
• the friction element is subject to pressure generated by the first pressure element and is inserted between the adjustment ring and the ring surface, and
• the pressure applied via the first pressure element can be removed by way of the second pressure element inserted into a top face of the adjustment ring.