noun
eyepiece; ocular lens
Technical term for the lens you look through in a microscope, telescope, or similar optical device. Often used interchangeably with 接眼レンズ.
See also: 接眼レンズ
顕微鏡の接眼鏡をのぞいてみた。
I looked through the eyepiece of the microscope.
この望遠
This telescope comes with a high-magnification eyepiece.
The objective lens at the opposite end of the optical path, closer to the specimen or object being viewed.
Compound of 接眼 (setsugan, 'eye-contact') and 鏡 (kyō, 'mirror/lens'), literally 'eye-contact lens'. The exact historical derivation is uncertain, but the term is a straightforward technical coinage.