One mask. Two ways to fit.Bahtinov focusing mask: use it on your telescope or the matching shield. SCT/Mak example shown; the part shape and fit are matched to your selected telescope.
What correct focus looks likeIllustration, not a captured star image. Adjust focus on a bright star until the central spike crosses the center of the X; remove focusing masks before normal imaging.
Photos & design details1 / 3
Product photograph and CAD illustration shown. Shape varies by telescope model.
Know when you are in focus.
Illustration, not a captured star image. Adjust focus on a bright star until the central spike crosses the center of the X; remove focusing masks before normal imaging.
On a bright star, adjust focus until the central spike crosses the center of the X.
Use the same mask directly on your telescope or in the matching shield. Remove it before normal observing or imaging.
Where matching components are offered for your selected telescope model, the masks and dust cap can be used directly on the telescope or with the matching StargazeWorks dew shield. Check each product’s model options before combining parts.
Celestron C5 / NexStar 5SE: These options are for modern C5 SCT and NexStar 5SE front cells. Older C5, C5+, G5 and early NexStar 5 models need separate sizing; contact us before ordering.
Orion XT8: Front-cell dimensions vary by generation. If you are unsure which version you have, contact us before ordering so we can confirm the right sizing.
Designed to work together
One system. With or without the shield.
The masks and dust cap fit both your telescope directly and the matching StargazeWorks dew shield. Choose pieces for the same telescope model and use the setup that suits your session.
01
Choose your setup
Use the focusing mask directly on your telescope or in the matching StargazeWorks shield.
02
Find focus
Point at a bright star and adjust focus while watching the diffraction pattern.
03
Start observing
Remove the focusing mask before observing or imaging.
Preview a color
Illustrative CAD views show one model example. Geometry varies by telescope. Rendered colors are approximate; choose your order color above.
Made for your model
Made for your telescope.
Select the full model name in the menu above, then choose your color. Similar apertures can have different fittings.
The mask produces an X-shaped diffraction pattern with a central spike. Adjust focus until that spike is centered in the X, then remove the mask.
Should I choose a Bahtinov or tri-Bahtinov mask?
Choose this mask for a straightforward focus check. The tri-Bahtinov divides the aperture into three sectors to help inspect optical alignment as well.
Which telescope model should I choose?
Choose the full telescope model name, then your color. Similar apertures can have different fittings. Sky-Watcher Explorer 150P / 150PDS and Quattro 150P use different parts; select the one you own. Contact us if your model is unclear or not listed.
What if the fit is not right?
If a part does not fit the telescope model on your order, contact us within 30 days of delivery. Confirmed fit or manufacturing issues receive a replacement at no charge. The guarantee does not cover selecting the wrong telescope model.
When will it arrive?
Normally dispatches in 1–3 business days. U.S. standard shipping is $8, or free on orders of $35 or more, with an estimated 3–5 business days in transit after dispatch. Express shipping is $15, with an estimated 1–2 business days in transit. Delivery estimates are shown at checkout.
Can you help me choose or use the system?
Tell us your model, which StargazeWorks parts you already have, and what you want to do. We can help you choose the right pieces or check how your setup works together. Use the question form on this page or contact us before ordering.
Let’s get your setup right
Ask us anything.
Tell us your model, which StargazeWorks parts you already have, and what you want to do. We can help you choose the right pieces or check how your setup works together. Send your question here. We’ll reply by email.
