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In the almost 15 years since the release of the fifth edition of The Universe and Beyond, our understanding of the universe has advanced exponentia...

A portable guidebook for enjoying the night sky in 2025. 2025 Night Sky Almanac is the ideal resource for both novice and experienced sky watchers ...

Heater ring provides the most efficient heating directly to the corrector lens to prevent the formation of dew Permanently mounts to your existin...

T2 to T2 adapter Extend distance: 2mm

It includes 4 pieces of desiccant tablets.

The most comprehensive field guide available to the fabulous mysteries above—a must-have for any enthusiast's day pack or home library—from the go-...

  80 mm Refractor Spotting Scope Multi-Coated optics 45° viewing angle 20-60x zoom eyepiece Sight tube for quick targeting Waterproof Soft carryin...

Answers to the most popular astronomy questions of today. Over the course of their illustrious work in astronomy, Heather Couper and Nigel Henbes...

Finder Charts are printed on white vellum card stock to make them durable. The black printing and stars on a white background makes them easily rea...

Imagine a world without light. What would it be like? Dark, cold, and lifeless! In Explore Light and Optics! With 25 Great Projects, readers ages 7...

Updated star maps include all sky events occurring in 2017 and beyond. Praise for the previous edition: "A concise introduction to the night sky ...

It's the 2020 edition of Professor Noggin with all new photos! Kids will enjoy transferring their energy to learning about Energy, Motion, and Gas...

PLAY & LEARN: Professor Noggin’s series of educational card games encourages kids to learn interesting facts about their favorite subjects. F...

Optolong UHC nebula clip filter for Canon EOS full frame cameras! The UHC (Ultra High Contrast) broadband filter is designed to improve the visibi...

  Optolong L-Pro clip filter for Canon EOS full frame cameras! The L-Pro is designed to improve the visibility of various deepsky objects. By selec...

Optolong L-Pro clip filter for Canon APS-C cameras! The L-Pro is designed to improve the visibility of various deepsky objects. By selectively redu...

L-eNhance clip-filter designed for Canon EOS APS-C format cameras.  It is a dual-band pass filter which has been designed for DSLR, color CMOS and ...

Optolong H-Alpha 7nm filter is the popular narrowband filter allowing 7nm bandwidth of light centered on a wavelength of 656nm through, and reducin...

Use this adapter to connect a camera with female T-threads to a device with male C-threads. Ideal for using T-thread autoguiders such as the Orion ...

Use this female T-thread to male T-thread spacer to extend standard T-thread adapters to achieve the correct backfocus for your telescope. Availabl...

This is the top half of the Celestron CPC-1100 counterweight set. Use this if you already have a bottom slidebar kit from Celestron or Losmandy. In...

ASKAR FMA180 objective lens features Triplet air-spaced APO design,includes two pieces of ED (extra-low dispersion) glass, providing excellent corr...

0.92x Field Flattener / Reducer for all APOs 2 Glass Elements ED 55mm Back Focus, adjustable T2 AP85 to 469mm f/5.5 AP95 to 529mm f/5.5 AP106 to 64...

Portable 85mm Apochromat with ED lens made of Japanese glass  Enjoy crystal-clear observations and capture stunning astro photographs with the n...