Astrozap Focusing cap with built-in Bahtinov focusing mask for 80mm refractors and similar scopes

$Focusing cap with built-in Bahtinov focusing mask for 80mm refractors and similar scopes$ $Focusing cap with built-in Bahtinov focusing mask for 80mm refractors and similar scopes$ $Focusing cap with built-in Bahtinov focusing mask for 80mm refractors and similar scopes$ $Focusing cap with built-in Bahtinov focusing mask for 80mm refractors and similar scopes$ $Focusing cap with built-in Bahtinov focusing mask for 80mm refractors and similar scopes$

$Focusing cap with built-in Bahtinov focusing mask for 80mm refractors and similar scopes$

$Images showing how the Bahtinov mask changes a star's diffraction pattern as the focus changes.$

Image showing a typical Astrozap focusing mask with the Bahtinov wheel in the closed (dust cover function) position.

Image showing a typical Astrozap focusing mask with the Bahtinov wheel in the open (focusing) position.

Close-up of the foam-lined rim and one of the nylon screws that hold the focusing mask in place on your scope and allow it to fit a range of scope sizes.

Astrozap Focusing cap with built-in Bahtinov focusing mask for 80mm refractors and similar scopes

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$77.00

Availability: More on the way

This Astrozap Bahtinov mask focusing cap fits most 80mm refractors, such as the Astro-Tech AT80EDT, or any scope with an optical tube outer diameter between 101mm and 110mm . . .

SKU: FC80AZ