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To achieve true dynamic balance with a fork-mounted SCT, both top and bottom weights are required. See stock number CWCPC8-CS for the complete top ...

A new generation - the world-first - galaxy and nebula booster filter intended for shooting not only nebulae, but also galaxies by the use of the t...

M42 Sensor tilt adapter Product: M42 sensor tilt adapter Thickness: 5mm Suitable for APS-C cameras (ASI2600) You can connect it to M68 OAG and 2”E...

Easy to understand facts abut Insects, an Arachnid and a Crustacean Full-Color photographs of each Bug Thick and Durable Flash Cards that Child...

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...

What do you see when you look up into the sky at night? The moon, stars, maybe even a comet or asteroid? You can also see other planets! In Planet...

Take a look through the lens and discover the beauty and science of the magnificent world that is our night sky – and beyond.From the 150km- (93 mi...

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 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 attached them. This product is only intended to be used as a replacement.

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...

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'...

Unleash the power of your smartphone to take you on a guided tour of the night sky—no telescope experience required. Award-winning and patented...

Extra-Low Dispersion (ED) objective lenses provide high resolution, high contrast images that are virtually free of optical defects like chromati...

Extra-Low Dispersion (ED) objective lenses provide high resolution, high contrast images virtually free of optical defects like chromatic aberrati...

Tele Vue is pleased to introduce the Delos, mid-to-short focal length line of 20mm eye-relief, 72° apparent field of view eyepieces. Every optical,...

The perfect telescope for the small home observatory The Airy Disk 140mm Apochromat represents a top-tier telescope designed to meet the needs...

Replacement 2" holder for Quattro focusers that features a brass clamp ring and much tighter inside diameter tolerance to better hold imaging acces...

M68 Sensor Tilt Plate M68 sensor tilt plate (5mm) is independently developed by ZWO and specially made to match with the full-frame cooled camera Z...

Honders Advanced Catadioptric optical design Radiant Aluminum Quartz (RAQ)™ mirror coatings Wide-open 250mm focal length FAST f/2 focal ratio 5-in...

This adapter commonly comes with ZWO's astrophotography cameras that have M54 attachment threads.