With so much time and effort put into your polar alignment and autoguiding accuracy, it would be a shame to spoil a photo due to poor focus. This process is an essential step of any deep-sky astrophotography session. Focus Your Telescope with a Bahtinov MaskĪ Bahtinov mask can help you achieve a sharp focus for your astrophotography images. Niels Noordhoek.įree Bahtinov Mask Generator. The animation below shows you exactly how the diffraction spike pattern looks while focusing your telescope with a Bahtinov mask.Ī simulation of a Bahtinov mask diffraction pattern when focusing. I have been using a Bahtinov mask to focus my astrophotography telescopes for nearly a decade now, and I continue to use them for each and every imaging session. The mask creates a pattern that allows you to fine-tune the focus of the telescope to produce the signature “central star-spike” pattern. To use the mask, you simply need to cover the telescope’s objective and point the telescope at a bright star. The distinctive pattern of the Bahtinov design was created by Russian amateur astrophotographer Pavel Bahtinov in 2005.
A Bahtinov mask is a clever tool for precisely focusing an astronomical telescope.
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