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Holds standard 2" mounted filters with 48mm threads. Be sure to choose the correct version of Filter Slider you have.

Important things to know about HyperStar adapters: DSLR adapters will not work with the Filter Slider Filter Slider Adapters do not come with a St...

Performance The diagram above shows how the SCT Corrector improves the off-axis spot size on a Celestron 11" SCT. Performance is similar on other ...

* HYPERSTAR USERS: If you're ordering a Modular Filter Slider to use with your HyperStar, you will also need to purchase a Filter Slider Adapter...

  Dr. David H. Levy on HyperStar How to Install Your HyperStar HyperStar Promo Video The HyperStar 8 replaces the secondar...

The Starizona EvoFF field flattener turns the Skywatcher Evoguide 50 into a sharp, portable, wide-field imaging scope. The EvoFF has also been test...

Turn your Newtonian telescope into a fast, high-quality astrographic instrument with the Starizona Nexus focal reducer.Newtonian telescopes r...

With the Apex ED reducer, an f/5.5 apo refractor becomes an incredibly fast f/3.6 astrograph. A slower f/9 telescope like an RC becomes a speedy f/...

  Dr. David H. Levy on HyperStar How to Install Your HyperStar HyperStar Promo Video The HyperStar 11 replaces the seconda...

  Dr. David H. Levy on HyperStar How to Install Your HyperStar HyperStar Promo Video The HyperStar 6 replaces the secondar...

  Dr. David H. Levy on HyperStar How to Install Your HyperStar HyperStar Promo Video The HyperStar 9.25 works with any Fas...

Starizona's SCT Corrector has been an incredibly popular focal reducer and coma corrector, giving astrophotographers with standard Schmidt-Cassegr...

  Dr. David H. Levy on HyperStar How to Install Your HyperStar HyperStar Promo Video The HyperStar 14 replaces the seconda...

Celestron is pleased to announce the new NexStar SE Telescope Series! In the tradition of Celestron's famous orange optical tubes, the new NexStar ...

  The world’s most beloved telescope! The classic, 8-inch Schmidt-Cassegrain revolutionized amateur astronomy in the 1970s. Now, the iconic “orang...

Includes: Sky-Watcher 6-inch f/8 Dobsonian OTA. Rocker Base. 6X30 Finder and Bracket. 25 mm Plossl 1.25-inch Eyepiece. 10 mm Plossl 1.25-inch Eyep...

  Affordable, large 200mm aperture delivers stunning viewing experience 78% brighter than 150mm model Patented tension control handle allows for p...

  130mm aperture for bright, bold views  Fast f/5 optics for increased light gathering power  650mm focal length perfect for viewing the Moon, p...

  Affordable, large 250mm aperture delivers stunning viewing experience 56% brighter than the Classic 200P Dobsonian Patented tension control hand...

Celestron’s iconic “orange tube” design is updated with all the latest features to provide the best stargazing experience for beginners and experi...

Celestron’s iconic “orange tube” design is updated with all the latest features to provide the best stargazing experience for beginners and experi...

Large 130mm aperture delivers crisp, contrast-rich views of the Moon, planets, and so much more Fast f/5 focal ratio, 650mm focal length Borosili...

  Large 254mm aperture delivers dazzling views, 1200mm focal length, f/4.7 focal ratio Built-in Wi-Fi telescope control Innovative collapsible des...

Large 200mm aperture delivers stunning viewing experience Innovative collapsible design that retains collimation 816x more light-gathering power t...

  Large 406mm aperture delivers dazzling views, 1800mm focal length, f/4.4 focal ratio Built-in Wi-Fi telescope control Innovative collapsible des...

  Large 356mm aperture delivers dazzling views, 1650mm focal length, f/4.6 focal ratio Built-in Wi-Fi telescope control Innovative collapsible des...

  Large 305mm aperture delivers dazzling views, 1500mm focal length, f/4.7 focal ratio Built-in Wi-Fi telescope control Innovative collapsible des...

  Large 203mm aperture delivers dazzling views, 1200mm focal length, f/5.9 focal ratio Built-in Wi-Fi telescope control Innovative collapsible des...

  Large 300mm aperture delivers stunning viewing experience Innovative collapsible design that retains collimation 1840x more light-gathering powe...

  Large 250mm aperture delivers stunning viewing experience Innovative collapsible design that retains collimation 1235x more light-gathering powe...

<img src="https://cdn.shopify.com/s/files/1/0327/2569/6648/files/comparison.jpg?v=1624746966" alt="Optolong Filter Comparision"><br><...

0.85x Focal Reducer/Corrector for Sky-Watcher Evostar 80 ED APO is designed for serious Astro-Imagers. Optimized for the Sky-Watcher Evostar 80 ED ...