a magnetically positioned precision holder for optical components in an optical device comprises a carrier for replaceably holding at least one optical component . the carrier is arranged in positionally adjustable fashion in a housing recess including a precision stop surface . magnet pairs are oriented with identical polarity being provided in order to achieve a continuous contact pressure of the carrier against the stop surface , in such a way that the one magnet is located in the recess and the corresponding magnet is located in the carrier . the use of identically poled magnet pairs for movable precision holders and for precision positioning systems is also proposed .