Aluminum Bahtinov Focus Tool for Small Telescopes Small it will remain secured until

it will remain secured until you're ready to remove it

Bahtinov focus masks provide simple

Don't miss another clear night

Fits an Outer Diameter of 290-340 mm

Aluminum Bahtinov Focus Tool for Small Telescopes Small it will remain secured untilWhy are my stars so blurry?? After a long night taking pictures of the sky, nothing is worse than reviewing your images and finding that your stars were just barely out of focus. Maybe it looked right in the live view screen, but once they're imported to the computer, the fuzzy stars stand out like trophies of a wasted night. We've all been there. But it doesn't have to happen again The Bahtinov Mask is your answer. This inexpensive tool creates