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Description The secondary mirror cover can be used to cover the rear side of the secondary mirror. This considerably reduces the cooling of the se...

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

A compact 96mm apochromat for powerful images A compact apochromat for powerful images This APO with a 96mm aperture offers This APO with a 9...

A compact 96mm apochromat for powerful images This APO telescope, boasting a 96mm aperture, presents a delightful combination of outstanding opt...

Machined aluminum bracket and shaft coupler to attach a ZWO EAF motor to a 3.5" Feathertouch Focuser.

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...

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...

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...

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...

The narrow-bandpass OIII filter improves the view of emission and planetary nebulae. The filter works by blocking natural and artificial light poll...

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