Cloud Break Optics

Bahtinov Mask Cover (Patented) for WO 81 Series Telescopes (CPBM-81)

Bahtinov Mask Cover (Patented) for WO 81 Series Telescopes (CPBM-81) - Main image
Bahtinov Mask Cover (Patented) for WO 81 Series Telescopes (CPBM-81) - View 2Bahtinov Mask Cover (Patented) for WO 81 Series Telescopes (CPBM-81) - View 3Bahtinov Mask Cover (Patented) for WO 81 Series Telescopes (CPBM-81) - View 4Bahtinov Mask Cover (Patented) for WO 81 Series Telescopes (CPBM-81) - View 5Bahtinov Mask Cover (Patented) for WO 81 Series Telescopes (CPBM-81) - View 6
$68.93 $113 In stock

Category: Focusing

The Bahtinov Mask Cover (Patented) from William Optics is designed for WO 81 Series Telescopes, including the GT81. It is offered here in a Gold color option and belongs to the Focusing category.

  • Compatible with WO 81 Series Telescopes, including GT81
  • Patented Bahtinov mask cover design
  • Brand: William Optics
  • Color option: Gold
  • Product code: CPBM-81
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Standard Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

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Standard Shipping · United States: $0.00

Express Shipping · United States: $3.99

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United States · Return window (days after delivery): 30. Return method: By mail. Return postage: Seller pays.

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Customer Reviews (4.8 / 5 · 5 reviews)

William H. ★★★★★

The mask snaps onto my GT81 perfectly with no play, and focusing stars snapped into crisp diffraction spikes on the first try. It’s a solid upgrade that makes achieving perfect focus almost effortless.

Mia T. ★★★★★

The gold finish looks even better in person than I expected, and the mask snapped onto my telescope tube securely with zero play. I had a sharp focus on Jupiter within seconds after my first try using it.

Richard C. ★★★★★

The gold finish matches my telescope tube perfectly, and the mask snapped into place on the first try with a satisfying click. Focus was dead-on after just one test shot.

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