A Bahtinov focusing mask in use on the front of the AT6RC telescope
A Bahtinov focusing mask in use on the front of the AT6RC telescope
Bahtinov Mask
When you want to see the stars, find someplace dark
A Bahtinov focusing mask in use on the front of the AT6RC telescope
A Bahtinov focusing mask in use on the front of the AT6RC telescope