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This is a replacement for the secondary mirror mounting plate that is included with the HyperStar 6.

This is the top half of the Celestron 9.25" SCT counterweight set. Use this if you already have a bottom slidebar kit from Celestron or Losmandy. I...

Note that this version of the counterweight set will not work with the CPC-925 telescopeTo achieve true dynamic balance with a fork-mounted SCT, bo...

This is the top half of the Celestron CPC-925 counterweight set. Use this if you already have a bottom slidebar kit from Celestron or Losmandy. Inc...

Optolong UHC nebula clip filter for Canon EOS APS-C cameras! The UHC (Ultra High Contrast) broadband filter is designed to improve the visibility ...

All Starizona motors come with the correct gears and tools to attach them. This product is only intended to be used as a replacement.

Vixen's newer refractors have a fine-focus mechanism that is attached to the existing focuser pinion by a thin metal plate. This plate is a weak po...

The UHC (Ultra High Contrast) broadband filter is designed to improve the visibility of various deepsky objects. The UHC (Ultra High Contrast) bro...

This is the top half of the Celestron 11" SCT counterweight set. Use this if you already have a bottom slidebar kit from Celestron or Losmandy. Inc...

Best-selling star chart, ideal for beginning astronomers!These charts are the perfect way to learn the stars and constellations. Simply rotate the ...

Authors: Bruce GrubbsPaperback: 368 pages, 3rd Ed.Lace up your boots and sample 120 of the finest trails in Arizona. Hike the Boucher-Hermit Trails...

When closed, the Bullet Space Pen is the perfect size to carry in your wallet, pocket, purse, car glove box, organizer, or toolbox. When opened it'...

Witness the wonder of the starry sky -- constellations, planets, auroras, and more -- in this profusely illustrated large-format atlas from Nationa...

Cosmos is a visually captivating journey through the Universe and is as expansive as the Cosmos itself. It covers everything from the asteroid belt...

The newest model of Starizona's Nexus 0.75x coma corrector features a removable lip which allows a threaded adapter to be installed.  This gives a ...

Following the Askar N160, ASKAR updates the same product line with a larger-aperture Newtonian reflector telescope—the Askar N210. This new model b...

Used Celestron 8-24mm zoom eyepiece in excellent condition.

Used 1.25" Tele Vue 3x Barlow in excellent condition.  Original box is a bit scuffed but Barlow looks great.  Thumb screw may not be the original b...

Like new Celestron Luminos 23mm eyepiece.  Most likely came with an EdgeHD telescope and was never used.

50mm Dedicated H-Alpha Solar Telescope The LS50THa Standard Kit is Lunt's most popular solar telescope — and the reason is straightforward. It puts...

40mm Dedicated H-Alpha Solar Telescope — Imaging Ready The LS40THa Enhanced Kit builds on the Standard's outstanding optical performance with two t...

E-Wipe® professional cleaning system for critical optics, are conveniently packaged to combine an ultra pure non-abrasive wipe (Pec*Pad® non-abrasi...

The southwestern deserts are home to hundreds of species specially-adapted to survive in this hot, dry environment. This beautifully illustrated gu...

Birds of Mexico and Central America is the only field guide to illustrate and describe every species of bird in Central America from Mexico to Pana...

From dazzling gemstones to sparkling crystals to molten lava, this brilliantly illustrated book introduces children to the exciting world of rocks ...

"A well-illustrated overview of the science and (literal) impact of these space rocks."-- Science News, on the first editionLeading experts in the ...

Get ready to blast off! From Moon rockets to Martian rovers, satellites to space stations, this book is your guide to the ultimate form of transpor...

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 night sky is full of amazing things, but how do you know what you're looking at or how to get the best view? 100 Things to See in the Night Sky...

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.