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Additional threaded 2.5-pound bottom counterweight for Starizona counterweight sets (for NexStar GPS and CPC telescopes). Necessary for heavy loads...

A filter for enchanced H-alpha nebula observations with UV/near IR suppressiong function - especially removing red end spectrum interference. The H...

With the upgrading of electronic astronomical accessories, electronic devices are more and more widely used in astronomical observation and astroph...

IDAS NB3-PM: PM stands for Passband Modification  Nebula Booster NB3-PM filter for OIII and SII the NB3, OIII and SII emission lines respectively. ...

Use this adapter to connect a T-ring or T-mount camera to a 2" focuser. Low profile design keeps backfocus short. Threaded for 48mm filters.

This 3D printed case will hold our Origin filter drawer and a mounted filter, keeping the filter clean and safe and ready to go between sessions.  ...

Sky-Watcher’s SynScan USB brings older Sky-Watcher mounts into the 21st century, by eliminating the need for outdated serial connections. For thos...

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...

The latest book by noted astronomer David Levy (do-discoverer of the Shoemaker-Levy comet which slammed into Jupiter in 1994. This book, geared tow...

To achieve true dynamic balance with a fork-mounted SCT, both top and bottom weights are required. See stock number CWCPC11-CS for the complete top...

Use this adapter to put a 2" male nosepiece onto the original (non-modular) Starizona Filter Slider to use on anything that accepts a 2" barrel.   ...

The 0.8x reducer can bring Askar 140APO's focal ratio down to F5.6. This is a standard reducer with field flattening capabilities as well. A shor...

The 1.0x flattener does not change the telescope's focal ratio itself. After connecting with the Askar 140APO, it still maintained a focal ratio ...

The Celestron Aluminum Dew Shield with Cover Cap is an essential accessory that protects your telescope tube in the field. The dew shield reduces r...

This cute little Bahtinov mask plugs into the front opening of the ZWO Seestar S50 and help with manual focusing.  3D printed from durable carbon f...

Celestron's Star Diagonal lets you view objects that are at a 90° angle from the direction the telescope is pointing, thereby allowing comfortable ...

  CNC machined primary mirror mask made of aluminum (EN AW-6061), black matt anodized, suitable for 8" TS-Optics/GSO Newtons The precisely machine...

The Antlia V-Series Luminance filter is available separately for use as a high-quality UV/IR filter.

Cable Length: 0.5 meters USB Connector Type: Type-B(male) to Type A(male)

A Modern Guide to Planetary Imagingis a new DVD release from renowned planetary observer and astronomer Damian Peach. This DVD provides a wealth of...

Baader H-alpha / O-III / S-II Ultra-Narrowband (Narrowband) filter set - Premium Grade 3.5 / 4 nm half width (to harmonize the exposure time of H...

Galaxy and Nebula booster plus Comet enhancing filter A new generation filter covering multiple objects including comets, galaxies, the Milky Way, ...

Made of anodized aluminum with female threads.

High-quality quintuplet air-spaced SD glass Petzval Astrograph.   Product introduction ...

The newest Panoptic eyepiece is a 1.25" model with a weight of just 0.5 pounds. It has the same 68-degree apparent field as the other Panoptic eyep...

Made of anodized aluminum.

Our M42-to-M54 Step Ring with Lip adds a stop to keep the ring from threading too far in.  Ideal for using a ZWO CAA with an SCT T-adapter, for exa...

This M42-to-M48 Step Ring features a built-in lip that acts as a mechanical backstop, preventing over-threading into larger M48 connections. Perfec...

This adapter enables you to mount your unmounted 50.8mm filters to 48mm threads. This mount will allow you to use unmounted 50.8mm filters with Sta...

The iconic saguaro cactus is one of thousands of species of plants growing in the diverse ecosystems found throughout the southwestern deserts. Thi...

Pre-order for Askar 0.75x Reducer for 71F Telescope. More information coming soon!

Accurate balance is necessary for the best telescope performance. Adding heavy accessories such as 2" eyepieces or cameras to a scope requires the ...

This version of the Counterweight Set will not work with the CPC-800. For the correct version, click here.Accurate balance is necessary for the bes...

Standard visual back as included with Celestron SCTs. Adapts 1.25" accessories (such as diagonals, camera adapters, etc.) to the standard SCT threads.

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...

ASKAR FMA180 objective lens features Triplet air-spaced APO design,includes two pieces of ED (extra-low dispersion) glass, providing excellent corr...

This part is used to replace the removable lip on the newer model Starizona Nexus 0.75x coma corrector, providing a male M54.5 x 1 thread for a dir...

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

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...

The ALP-T dual band 3.5nm SII&Hb filter is a dual narrowband filter, which lets the deep red Sulfur-II 672.4nm and the blue Hydrogen-Beta 48...

Extension tube for Wave carbon fiber tripod  7-inch (180mm) length  3.9-inch (100mm) radius  Weighs 2.4 pounds (1.1kg) Carbon Fiber Tripod not inc...

This adapter allows the use of a Feathertouch SCT MicroFocuser on an older Celestron 8" SCT (orange tube and some older black tube models). Include...