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Item Description: Achromatic Hand Figured Doublet in Push-Pull style cell  Lens Diameter: 104 mm Clear Aperture: 100 mm No of Elements: 2 Focal Le...

100% Safe for Eclipse Viewing Lightweight and generally does not require rebalancing tube assembly. Stronger than any other solar filter film on t...

Antlia OIII EDGE narrowband filter optimizes the FWHM (full width half maximum) to 4.5nm bandpass. The suppression of optical density (OD)5 on unwa...

Antlia H-alpha EDGE narrowband filter optimizes the FWHM (full width half maximum) to 4.5nm bandpass. The suppression of optical density (OD)5 on u...

Fisher Space Pen’s Sealed Pressurized Ink Cartridge performs in temperatures from -30º F to +250º F, underwater, in zero gravity, at any angle - ev...

Whether you’re in the field filling out a tag for that once-in-a-lifetime trophy or marking off your checklist of the never-ending chores that need...

Stars which are eight times or more massive than our Sun end their lives in a most spectacular way; they go supernova. A supernova is the most powe...

To achieve true dynamic balance with a fork-mounted SCT, both top and bottom weights are required. See stock number CWCPC925-CS for the complete to...

Replacement fan for 2600,6200,2400 cooled/pro cameras

Use with focuser FTF3015B-A Known To Fit Celestron C11/CPC11, C14/C14 Edge HD telescopes Thread on Entry (OTA | FRONT) Side of Draw Tube 3.29x16tpi...

Celestron’s new Nature DX Series is the perfect companion for the outdoors lover. These affordable yet feature-packed binoculars are designed speci...

2.8 million 4.54µm square pixels for high-resolution imaging Low-noise electronics for the best sensitivity High Quantum Efficiency Regulated cool...

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...

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 9.25" SCT counterweight set. Use this if you already have a bottom slidebar kit from Celestron or Losmandy. I...

Note that this version of the counterweight set will not work with the CPC-925 telescopeTo achieve true dynamic balance with a fork-mounted SCT, bo...

40 lbs payload capacity Dual-fit Vixen/CG-5 and Losmandy/CGE dovetail saddle 2" steel legs with height index marks for quick leveling USB 2.0 port...

We can make a variety of custom adapters for the HyperStar lens. These are often used with system such as filter drawers or with uncommon camera se...

We can make a variety of custom adapters for the HyperStar lens. These are often used with system such as filter drawers or with uncommon camera se...

Vixen's newer refractors have a fine-focus mechanism that is attached to the existing focuser pinion by a thin metal plate. This plate is a weak po...

Adjustable 108mm guidescope ring set. Fits Losmandy V Series dovetail plates.

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...

Best-selling star chart, ideal for beginning astronomers!These charts are the perfect way to learn the stars and constellations. Simply rotate the ...

Best-selling star chart, ideal for beginning astronomers!These charts are the perfect way to learn the stars and constellations. Simply rotate the ...

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...

Author: O. Richard NortonPaperback: 444 pagesThis popular nontechnical introduction to meteorites, asteroids, comets, and impact craters is now eve...

Author: Robert Michael PylePaperback: 280 pagesThis essential handbook covers where to find butterflies; how to observe and photograph them; their ...

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'...

In manufacturing, it is not often that a design becomes instantly classic or iconic. It takes a lot of time, appreciation by its peers, and a trac...