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Unrivaled in its breadth, Universe explores every aspect of the cosmos, from the big bang to planets in our solar system and beyond. Detailed profi...

The crystal cosmos of the ancient Greeks. The medieval sea above the sky. The secret messages hidden in starlight. With thrilling stories and spect...

Explore constellations, stars, galaxies, nebulae, globular clusters, and more. Investigate the planets in our solar system and comets, too! By John...

Space! Jaw-dropping computer-generated illustrations reveal the wonders of teh universe, from the big bang and black holes to space travel. Journey...

The 0.75x reducer can bring Askar 91F's focal ratio down to F5, providing not only a faster focal ratio but also built-in field-flattening correcti...

A flash, a single streak of light, is what sparked David Levy’s passion for astronomy more than sixty years ago. In this delightful collection of e...

A fully illustrated, portable guidebook for enjoying the night sky in 2026. Night Sky Guide 2026 is the ideal resource for both novice and experien...

An international fleet of unmanned lunar probes sent by the United States, Russia, Europe, India, Japan, and China has filled many gaps in our know...

A fully illustrated, portable guidebook for enjoying the night sky in 2027. Night Sky Guide 2027 is the ideal resource for both novice and experien...

Use this visual back to attach a 2" diagonal or other 2" accessories to the back of a Schmidt-Cassegrain telescope using the standard 2"-24tpi thre...

Optolong L1 Dual-Combo Set Two approaches to the deep sky. The Optolong L-Quad Enhance + L-Para Filter Set pa...

The Optolong L-Ultimate 2" filter is a precision 3nm dual-narrowband light-pollution imaging filter designed for high-contrast emi...

Designed with the outdoor enthusiast in mind, waterproof and fully rubber armored Phase coated BaK-4 prisms for increased contrast and resolution ...

Celestron’s award-winning Nature DX 12x50mm binoculars are the perfect companion for your next outdoor adventure. The views through Nature DX riva...

Explore Scientific Waterproof Eyepieces - Comfort, Quality, Value. The Explore Scientific 62° Series eyepieces are excellent flat-field multi-eleme...

Observatory-Class Precision Mount Astro-Physics 1150GTO Precision tracking. Serious payload capacity....

1.0x flattener Compatible with Esprit 70EDX and Evostar 100EDX 44mm image circle Designed for the Sky-Watcher Esprit Esprit 70EDX and the Evostar...

The Antlia 3nm Pro SHO Narrowband Filter Set combines three 2" mounted filters—Sulfur II, H-alpha, and Oxygen III—for high-contras...

Used Celestron Luminos 31mm eyepiece.  Very good condition.  Includes original caps, no box.

Used Explore Scientific 14mm 100-Degree eyepiece.  Excellent condition.  Includes original caps, no box.

Used HyperStar 9.25 v3.  Excellent condition.  Includes adapter for 17.5mm backfocus M42 camera (ZWO, etc.)

Used HyperStar C11 v3.  Excellent condition.  Includes adapter for 17.5mm backfocus M42 camera (ZWO, etc).  Can be used on EdgeHD scope with option...

Used HyperStar C8 v4 with Filter Slider.  Excellent condition.  Includes adapter for ZWO 17.5mm backfocus M42 camera.

Used Baader Morpheus 4.5mm eyepiece.  Like new.  Includes original box, caps, eyeguard and soft case.

Used ZWO ASI183MM Pro monochrome camera.  Excellent condition.  Includes all original cables, adapters, case and box.

Used ZWO EFW 5x2" filter wheel.  First generation model.  Excellent condition. Includes original adapters, screws, USB cable and box.

Meticulous Mid-Range Machinery. Powerful. Compact. Precise. Dual-axis belt drives deliver whisper-quiet, extremely accurate movement for both axes ...

Introducing the ASI676MC/MM , the all-sky camera featuring a unique square 1/1.6-inch image sensor and a super high resolution of 12MP! It is perfe...

Designed with the discerning astrophotographer in mind, Sky-Watcher’s top-of-the-line Esprit EDX refractors deliver the kind of imaging performanc...

The Askar 0.74× reducer, specially optimized for the Askar 111F, is designed to unlock a broader and more efficient deep-sky astrophotography exper...

Lightweight & Compact - Designed for Both Visual Observation and Astrophotography *Focus can be achieved within a back focus range of 45-75 m...

ANORAMIC VIEWS. PINPOINT PRECISION. Ultra-Wide Field of View Experience an expansive, immersive view of the night sky with an ultra‑wide field of v...

ANORAMIC VIEWS. PINPOINT PRECISION. Ultra-Wide Field of View Experience an expansive, immersive view of the night sky with an ultra‑wide field of v...

PANORAMIC VIEWS. PINPOINT PRECISION. Ultra-Wide Field of View Experience an expansive, immersive view of the night sky with an ultra‑wide field of ...

Developed for the Stellarvue FSV-3B series focusers, this is the 3rd generation of Optec's DirectSync motor. The SVX30 ThirdLynx control circuit fe...

Designed for iOptron® GOTO mounts for an additional 8 inches of extra height. Fits the following iOptron® tripods/piers: LiteRoc Tripod for AZ Mo...