StarField Bahtinov Mask - 140 mm - FM-140 61 mm Refractors Explore Scientific Nebula Filter CLS

Explore Scientific Nebula Filter CLS 2"

Color recognition will be retained

Taper brass altitude washer X1

080" (2 mm) Long Accessory Tube for 2

Celestron Product Number: 18774

StarField Bahtinov Mask - 140 mm - FM-140 61 mm Refractors Explore Scientific Nebula Filter CLSThis StarField Bahtinov Mask is sized for 125 mm 130 mm telescopes and fits dew shields with an outside diameter of 153 mm to 192 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