A long-range optical device (1), in particular a telescopic sight, comprising a reticle (6), the position of which is adjustable, and an associated reticle adjustment device (7) for adjusting the position of the reticle (6), a magnetic device (16) comprising a plurality of magnetic elements (16a, 16b), a detection device (18) associated with the magnetic device (16), wherein the magnetic device (16) is mounted so as to be movable relative to the detection device (18) and/or the detection device (18) is mounted so as to be movable relative to the magnetic device (16), wherein the detection device (18) is configured to detect the relative movements between the magnetic device (16) and the detection device (18) and, based on detected relative movements between the magnetic device (16) and the detection device (18), to generate reticle position information describing the position of the reticle (6).