Definitions

1. noun

A person or thing that focuses or brings something into clear focus, especially an optical system or a camera.

“The focuser on the telescope helped the astronomer to obtain a clear image of the distant star.”

2. noun

A device or mechanism used to adjust or control the focus of an optical system or a camera.

“The focuser on the camera allowed the photographer to fine-tune the focus for the perfect shot.”

3. verb

To adjust or control the focus of an optical system or a camera.

“The focuser was used to adjust the camera’s focus for the close-up shot.”