seeing at a distance; long-distance viewing
Primarily used in technical or compound contexts, such as optics and photography. Rarely used as a standalone noun in everyday speech.
I photographed a distant bird with a telephoto lens.
Observe stars using a telescope.
telescope
telescopefish
telephoto lens
Cassegrain telescope
Galilean telescope
Keplerian telescope
Compound of 望 (ぼう, 'hope, desire, view') and 遠 (えん, 'distant'). The combination conveys the idea of viewing something far away.