Optoelectronic device for use as a monocular and as an attachment for optical devices, at least having an image sensor (150), a display unit with a display surface for displaying image information, a control, optical elements for refraction of light, an eyepiece (190) and at least a first sensor element ( 180), where - the display resolution is larger than the image sensor resolution, the optoelectronic device can be connected to an optical device, - The at least one first sensor element (180) is arranged in the area of the eyepiece (190), and - The control unit automatically switches from a first display mode, in which the image information recorded via the image sensor (150) can be represented essentially over the entire display area of the display unit, to at least a second display mode, in which the image information recorded via the image sensor (150) can be displayed scaled in only a section of the display area of the display unit, if the at least one first sensor element (180) gives feedback that the optoelectronic device is connected to an optical device, and the control unit automatically switches over from the at least one second display mode in the triggers the first display mode when the at least one first sensor element (180) gives feedback that the optoelectronic device is no longer connected to an optical device.
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