Photographic arrangement of all four included black parts: Premium light-control dew shield, tri-Bahtinov mask, isolation mask and dust cap.

Complete Premium Telescope System with Light Control Shield

Meade ETX-90 Mak / Black

$86.99

What's included4 components

Four-piece Premium kitPhotographic component layout

Black component photographs shown. Shape varies by telescope model.

Four-piece Premium kit, image 1 of 6.

Complete Premium Telescope System with Light Control Shield

Stray light control. Focus. Protection.

Complete Premium Telescope System with Light Control Shield

Control stray light, check focus and alignment, then cover your optics. This four-piece telescope kit combines a Premium light-control dew shield, tri-Bahtinov mask, isolation mask and dust cap.

$86.99

Telescope Model

Color

See all four colors in the renders below ↓

U.S. standard shipping: $8 under $70; free at $70 or more. Delivery details.

Ask a question about your setup →

Model, fit, or choosing parts — we can help before you order.

Stray light control. Focus. Protection.

4 pieces. One system.

Includes the dew shield for stray light control, tri-Bahtinov mask, isolation mask and dust cap. Spike masks are sold separately.

01

Dew shield for stray light control

Internal rings, called baffles, help redirect light arriving at an angle away from the optics. Their shape is informed by ray tracing. The shield also helps delay dew on exposed front optics.

02

Tri-Bahtinov mask

Creates three diffraction patterns to help you judge focus and optical alignment on a bright star.

03

Isolation mask

Used with the tri-Bahtinov mask to cover two sectors and examine one pattern at a time.

04

Dust cap

Covers the telescope or matching shield between sessions to help keep dust off the front optics.

Build your setup

See how the matched Premium system works from setup to storage. Read the telescope accessory guide, compare dew shields, or browse matched accessory kits. Choose the same telescope model for every matching part.

Designed to work together

One system. Control light, focus and protect.

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

Set up your way

Fit the shield when you need it. The focusing masks also fit directly on your telescope.

02

Check your setup

Use the tri-Bahtinov mask, then add the isolation mask to examine one pattern at a time. Follow your telescope's instructions for collimation adjustments.

03

Observe, then cover

Remove the focusing masks before observing or imaging. Fit the cap to the telescope or shield when you finish.

Black — CAD product/assembly illustration — Illustrative CAD views show the four-piece system. Masks and cap are used at different stages; parts are separated for clarity. Geometry varies by telescope. Rendered colors are approximate; choose your order color above.

Brick Red — CAD product/assembly illustration — Illustrative CAD views show the four-piece system. Masks and cap are used at different stages; parts are separated for clarity. 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.

Baffled shield fitted to a real Celestron SCT. Telescope is not included.

Tri-Bahtinov mask seated in a matching shield on a real Celestron SCT. Telescope is not included.

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.

Apertura AD8 Dob
Celestron 130EQ / 130SLT
Celestron 4SE Mak
Celestron 6in Dob
Celestron 8in Newt
Celestron C5 SCT / 5SE SCT
Celestron C6 SCT / 6SE SCT / Evo 6 SCT
Celestron C8 SCT / 8SE SCT / Evo 8 SCT / CPC 800 / EdgeHD 8 / AVX 8 SCT / CGX 800
Celestron C9.25 SCT / EdgeHD 925 / CPC 925 / Evo 9.25
Meade ETX-105 Mak
Meade ETX-125 Mak
Meade ETX-90 Mak
Meade LX200 10in ACF
Meade LX200 8in SCT
Meade LX90 10in ACF
Meade LX90 8in SCT
Orion XT8 8in Dob
Sky-Watcher 127 Mak
Sky-Watcher 130P
Sky-Watcher 150 Mak
Sky-Watcher 150P / 150PDS
Sky-Watcher 200P Dob
Sky-Watcher 250P Dob
Sky-Watcher Flx 200P
StarSense 10in Dob
SW Quattro 150P
Zhumell Z8 Dob

Sky-Watcher Explorer 150P / 150PDS and Quattro 150P use different fittings. Pick the one you own. Need help finding your model?

Before your first night out

A few useful details.

Printed to order in carbon-fiber-reinforced PETG (CF-PETG), with a matte finish and fine print layer lines.

Ask us about your telescope

How does the shield control stray light?

The rings inside a baffled dew shield intercept light coming in at an angle. Ray tracing helped us choose ring angles that direct reflections away from the optics and into the spaces between the rings.

Do I need the shield to use the masks and cap?

No. The masks and dust cap fit directly on your telescope and on the matching StargazeWorks dew shield. Choose all parts for the same telescope model. The isolation mask works with the tri-Bahtinov mask in either setup.

How do the four pieces work together?

Use the shield when you want it, and fit the tri-Bahtinov directly on the telescope or in the shield to check your setup. Add the isolation mask to examine one pattern. Remove the focusing masks before observing or imaging; use the cap on the telescope or shield when you finish.

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 $70 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.