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Telescopes Focuser

A focuser is used to hold an eyepiece. The image can be focussed using the focus wheels on the side.

More information:

Backfocus

The position of the focus, measured from the plug connection, with the eyepiece fully retracted.

Connection ( to eyepiece)

Focusers are available in 1.25" or 2" formats. Many 2" focusers also have a 1.25" adapter.

Type of build (1)

There are basically two different construction types: the rack and pinion focuser and the Crayford focuser.