StarField Bahtinov Mask - 180 mm - FM-180 Dew Shield Use a counterweight (sold separately)

Use a counterweight (sold separately) that is made to slide onto a 20 mm diameter counterweight shaft (like this one)

Alignment procedures: SkyAlign

In these instances

Mount: CG-2 Equatorial

StarField Bahtinov Mask - 180 mm - FM-180 Dew Shield Use a counterweight (sold separately)This StarField Bahtinov Mask is sized for 150 mm 165 mm telescopes and fits dew shields with an outside diameter of 185 mm to 210 mm. While basic, often home made focus masks have been used for quite some time, the Bahtinov mask, with it's distinctive pattern, is unique. Invented by Russian amateur astronomer Pavel Bahtinov, this mask has quickly become the astro imager's choice for fine focusing a telescope. To use, place the Bahtinov mask in front