Inspect one pattern at a time.Isolation mask covers two Tri-Bahtinov sectors so you can inspect one pattern at a time. SCT/Mak example shown; the part shape and fit are matched to your selected telescope.
The same parts fit both waysCelestron installation example. Matching masks and caps fit your telescope directly or the matching StargazeWorks shield. Check this listing for included parts.
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.
Why three sectors helpSeparate sector illustrations, not the full combined star pattern. The isolation mask covers two sectors so you can compare each reading in turn. It must match the Tri-Bahtinov mask.
Photos & design details1 / 5
Black component photographs shown. Shape varies by telescope model.
Read one pattern at a time.
Separate sector illustrations, not the full combined star pattern. The isolation mask covers two sectors so you can compare each reading in turn. It must match the Tri-Bahtinov mask.
This mask covers two sectors of a matching StargazeWorks tri-Bahtinov, so you can examine the remaining diffraction pattern.
Rotate it to check each sector. The pair works directly on the telescope or in the matching shield; the tri-Bahtinov is sold separately.
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
Start with the tri-Bahtinov
Fit your matching tri-Bahtinov mask directly on the telescope or in the shield.
02
Isolate a pattern
Place the isolation mask over the tri-Bahtinov and rotate it to examine each sector in turn.
03
Finish your check
Follow your telescope's instructions for adjustments. Remove both masks 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.
Real parts, in use
See the system on a telescope.
Original photographs show a Celestron SCT example. Check the captions for the parts shown.
Tri-Bahtinov and isolation masks fitted directly to a real Celestron SCT. Telescope is not included. The tri-Bahtinov mask is sold separately.
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.
It is designed to work with a StargazeWorks tri-Bahtinov mask. It covers two sectors of that mask to show one pattern at a time; it is not a separate focusing mask.
Can I use the pair without a shield?
Yes. The tri-Bahtinov and isolation pair works directly on the telescope or with the matching StargazeWorks shield fitted. Choose both masks for the same telescope model.
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.
