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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...

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

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...

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...

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...

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...

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

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...