StarField Bahtinov Mask - 180 mm - FM-180 Dew Shield loosen the three screws a

loosen the three screws a half turn and then unscrew the lock

5 mm focal length 82° AFOV

HDMI Mode: Plug in the included HDMI cable and power the microscope using the USB-C cable (and wall adapter

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In these instances

StarField Bahtinov Mask - 180 mm - FM-180 Dew Shield loosen the three screws aThis 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