bahtinov mask

How To Use a Bahtinov Mask to Focus Your Telescope

How To Use a Bahtinov Mask to Focus Your Telescope

A Bahtinov mask is a clever tool for precisely focusing an astronomical telescope. The distinctive pattern of the Bahtinov design was created by Russian amateur astrophotographer Pavel Bahtinov in 2005. To use the mask, you simply need to cover the telescope’s objective and point the telescope at a bright star.  The mask creates a pattern…