Bahtinov Mask Cover for WO Z61 (CPBM-61)

Bahtinov Mask Cover for WO Z61 (CPBM-61) - View 3

Bahtinov Mask Cover for WO Z61 (CPBM-61) - View 4

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Bahtinov Mask Cover for WO Z61 (CPBM-61) - View 6

$65.88 ~~$108~~ In stock

The Bahtinov Mask Cover for WO Z61 (CPBM-61) from William Optics is a Bahtinov and dust cap designed for the William Optics Z61 telescope. It combines a focusing aid with a cover for the telescope's front end.

Designed for the William Optics Z61 telescope
Functions as both a Bahtinov mask and a dust cap
Available in Red or Gold
SKU options: CPBM-61RD (Red) and CPBM-61GD (Gold)
Listed under the Focusing category

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Standard Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

Express 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 (4.4 / 5 · 5 reviews)

Scarlett Q. ★★★★★ Oct 21, 2026

The cutouts are perfectly spaced—the diffraction spikes on my test star shot came out razor-sharp on the first try. Fits snugly over the dew shield without any wobble.

William V. ★★★★★ Oct 19, 2026

Finally got perfect focus on my first try with this mask—the diffraction pattern is so much clearer than using a regular focusing routine. It’s nice that it doubles as a dust cover too, so one less thing to misplace.

Olivia ★★★★★ Oct 18, 2026

Fits my Z61 perfectly—the Bahtinov pattern snaps into sharp focus almost instantly, and it doubles as a snug dust cover when not in use. Makes critical focusing feel almost effortless, even for a beginner like me.