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Antlia SII Pro narrowband filter optimizes the FWHM (full width half maximum) to 3nm bandpass. As the bandwidth becomes narrower, the 3nm Pro narr...

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...

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

The ideal storage and transport solution for a wide range of tripods and their accessory trays with internal straps for a secure fit. Ultra-durabl...

This bracket allows easy mounting of the ZWO EAF autofocus motor to an Airy Disk triplet refractor.  Tested to work with 85, 96, 106 and 140mm mode...

Aluminum dew shield fits Celestron 6" SCTs with HyperStar Celestron 6 SCT & Hyperstar Dew Shield 12" in total length Top, bottom and side notc...

Note that this version of the counterweight set will not work with the CPC-1100 telescopeTo achieve true dynamic balance with a fork-mounted SCT, b...

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

Common T-rings use M42 threads and are not compatible with equipment that uses larger M48 threads.  Use this anodized aluminum T-ring to connect a ...

Made of anodized aluminum.

Made of anodized aluminum.

The Azimuth Adjuster Adapter is designed for use on the Twilight Medium Duty or Twilight Heavy Duty tripods.  This adapter also works with the Lig...

Upgrade your SQA-series telescope with this precision-machined metal extension kit from Askar. Engineered for compatibility with models lik...

Aperture size 50mm Focal length 190mm  Focal ratio f/3.8 Objective lens Quadruplet petzval APO（including one piece of SD g...

  T-Adapter for 9.25, 11 & 14” EdgeHD optical tubes. It threads onto the rear cell This T-Adapter allows you to attach your 35 mm DSLR camera...

Concept: Just as Delos eyepieces were developed based on Tele Vue's Ethos eyepiece design advancements, DeLite is the logical step toward a smaller...

Antlia H-alpha Pro narrowband filter optimizes the FWHM (full width half maximum) to 3nm bandpass. As the bandwidth becomes narrower, the 3nm Pro n...

Carrying case for most 8”, 9.25” or 11” Schmidt-Cassegrain or EdgeHD optical tube; along with the 8" RASA optical tube Space for carrying accesso...

M42 female to M42 male 4.5mm spacer.

All Pro cameras (with cooler) need to be connected to an external 11-14v power supply to image.  You can also use ASIAIR to power the cameras. Even...

In astrography, Nikon, Canon, Sony mirrorless cameras have been used more and more frequently by astronomy amateurs in recent years. Therefore, on ...

The 0.8x reducer can bring Askar 185APO's focal ratio down to F5.6. This is a standard reducer with field flattening capabilities as well. A shor...

40x to 600x magnification, up to 2400x with digital zoom 4.3" LCD touchscreen 5MP CMOS built-in digital camera 5 fully achromatic objective lense...

The largest aperture scope in the Ultima line, the 100mm Ultima offers more than 50% brighter images than the 80mm, allowing for better performanc...

Eyepieces at or near the 10mm range are often considered a mandatory focal length in your collection, as this focal length range is departure p...

Askar MCP90 (Multi-Connection Plate 90) is a professional design especially for FRA400/5.6 astrograph. But it also works well with other various ha...

This adapter ring will convert a standard HyperStar C14 into an HD version to work on an EdgeHD telescope.  It simply threads into the existing...

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...

The thickness of the M42M-M48F 22.5mm extender is 22.5mm. It is an important astronomical accessory for ASI2600MM Pro users who want to connect the...

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...

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...

Note that this version of the counterweight set will not work with the CPC-800 telescopeTo achieve true dynamic balance with a fork-mounted SCT, bo...

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