More Info on our Bahtinov Mask
The 80-110 Bahtinov Mask has sets of holes designed to be used with different diameters: Select the hole pattern which corresponds to the outside diameter of the telescope you wish to use it with, and insert the two rubber cones provided with your "Focus-Mask".
It's that simple, no fancy rings or tape required.
It doesn't have to be perfect, the closest size to fit your scope is all you need.
Press them thru far enough to secure them in place.
These are the hangers that will hold your mask in place while focusing.
WEBSITE ADDRESS PAGES:
Bahtinov Mask by Focus-Mask
The Easiest Way to Focus Your Telescope with a CCD/DSLR Camera
