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What is a focuser?

What is a focuser? Here are some definitions.

Noun
  1. A device which allows one to adjust the focus of an instrument such as a telescope.
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Examples
It is equipped with a precise, tighted rack-and-pinion focuser as well as a device of blocking the focuser course.
It offers a flat field, and comes equiped with a built-in camera angle adjuster and an oversized rack-and-pinion focuser.
Military action has absorbed the lion's share of his fabled gifts as a focuser.
You can now also control focusing, if you're using an LX200 telescope with the Meade electric focuser.
This kind of focuser has no limits in terms of load capacity or optical performance.
In the same goal, the focuser housing is long and the travel needed to reach focus is short.

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