focuser

A device which allows one to adjust the focus of an instrument such as a telescope.

Japanese Meaning

望遠鏡などの機器において、焦点を調整するための装置

Before the lecture, she carefully adjusted the focuser on the telescope to get a sharp view of Jupiter.

講義の前に、彼女は望遠鏡のピント調整装置を慎重に調整して、木星を鮮明に見えるようにした。

Sense（1）

A device which allows one to adjust the focus of an instrument such as a telescope.

I decided to upgrade my telescope with a feather-touch focuser.

focusers

（ plural ）