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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 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...