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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...

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...

This Vixen-style, narrow, universal dovetail plate from Askar is designed for a variety of setups. Compatible with Vixen-style mounts, this univers...

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...

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...

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...

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...

Conceived in a dream in July 1948, Paul Fisher was soon machining a new pen design shaped from solid aluminum. It became the first Fisher ball poin...

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...

Month-by-month information on meteor showers and how to make the most of watching them Advice on starting and building a meteorite collection plus...

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 ...

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...

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

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...

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...

The T2 tilter adds multiple screw holes to help connect to ZWO EFW (compatible to 2” EFW filter wheel). Package and size Main body：Diameter 78mm，11...

Suitable for cameras which back focus distance is 12.5MM or 17.5mm This new ZWO-EOS-T2-Ⅱ adapter has two parts (EOS-T2 adapter and 5mm length T2-ex...