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can be used on any 1
Glass Type: Neodymium substrate
Binoculars that fit your lifestyle
4 mm (11 in) Focal Length 2800 mm (110 in) Focal Ratio 10 Focal Length of Eyepiece 1 (mm) 40 mm (1
they can then be removed and replaced by other imaging filters
StarField Bahtinov Mask - 180 mm - FM-180 Red Dot Finder can be used on anyThis 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
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