The invention relates to a long-range optical device comprising at least one sight channel and an image capturing channel with a camera module, wherein the sight channel and the image capturing channel are coupled to one another by means of an adjusting mechanism such that a first image detail observed in the sight channel essentially corresponds to a second image detail captured by the camera module; an interface module for establishing a connection with an electronic terminal; a processing unit; a memory unit, and a support unit, in which support unit the sight channel is arranged, wherein a heat dissipation device is formed between the support unit and the processing unit and/or between the support unit and a housing of the sight channel and/or on the camera module. The invention moreover relates to an observation and image capturing system.