The focusers adjusted the lenses until the image became perfectly sharp.

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

Engineers adjusted the virtual focuses to optimize the augmented reality display's alignment.

The technician adjusted the laser focuses before the experiment to ensure proper beam alignment.

When she self-focuses, she often misses the needs of others.

Photographers often bring focusing cloths to dimly lit shoots to ensure precise manual focus.

For the vintage plate camera, he pulled the focusing cloth over his head and the back of the camera to see the image on the ground glass.

The photographer changed the focusing screens to suit each camera body.

Before every portrait session, she carefully cleans the focusing screen to ensure sharp, accurate framing through the viewfinder.

The Crayford focuser allowed me to achieve pinpoint sharpness on faint nebulae without the stick-slip of rack-and-pinion designs.