Bahtinov Masks

The Bahtinov mask works with refractors, Dobsonians, Maksutov Cassegrains and Schmidt-Cassegrains, 

Three metal posts on the mask enable it to grip your telescope tube firmly, and come with scratch-resistant covers that should protect the surface of your tube. They also keep the mask nicely centred.

This Bahtinov mask is light, meaning it shouldn’t affect the balance of your telescope too much during visual observing or during long exposure astrophotography sessions.