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H-α (hydrogen-alpha) at 656 nm (nanometers) is deep red in color and the most popular narrowband filter. Hydrogen is ubiquitous in the cosmos and i...

If you want the look of Hubble Space Telescope (HST) images, such as the famous “Pillars of Creation” (the Eagle Nebula, Messier 16), then the next...

In perfect condition, used Baader H-alpha / O-III / S-II Ultra-Narrowband (Narrowband) filter set - Premium Grade 3.5 / 4 nm half width (to harmo...

In perfect condition, open box Baader H-alpha / O-III / S-II Narrowband Filter Set - Precision Grade 6.5 nm FWHM, recommended for optical systems...

In perfect condition, open box Filter size 31 mm - round, unmounted - filter thickness 2 mm Set of L-R-G-B filters High-quality anti-reflective ...

Like new! Baader T-Ring to connect Nikon DSLR cameras onto the Astro T-2 system Results in the standard exact distance of 55.0mm from the front fac...

This used kit comes with: Nexstar 6SE telescope, mount and tripod Celestron Padded carrying case Celestron 2" Dieletric diagonal with twist lock C...

"This robotic WiFi telescope is the coolest app-cessory in the galaxy"-Wired.com"5-star overall rating"-BBC Sky at Night MagazineThe NexStar Evolut...

The NexStar Evolution keeps evolving. We’ve paired our best optics with our best technology to make an incredible versatile and portable telescope ...

"This robotic WiFi telescope is the coolest app-cessory in the galaxy"-Wired.com"5-star overall rating"-BBC Sky at Night MagazineThe NexStar Evolut...

"This robotic WiFi telescope is the coolest app-cessory in the galaxy"-Wired.com"5-star overall rating"-BBC Sky at Night MagazineThe NexStar Evolut...

In good condition. Adapters show sign of use.  Comes with all original adapters and in the original box. Features Most accurate way to guide – im...

Like new!Features Portable power pack for your computerized Celestron telescope using Lithium-Iron Phosphate (LiFePO4) chemistry Powers your telesc...

In fair conditionFeatures This Celestron T-Ring attaches to Canon EOS DSLR and SLR camera bodies Sturdy bayonet flange locks in place just like a l...

Like new!Features X-Cel LX eyepieces, optimized for planetary viewing, offer a 60° field of view through a six-element fully multi-coated lens syst...

In good condition, comes with BF10, one CEMAX 25mm eyepiece, and the original hard case. Does not come with tripod in image. <0.7 Angstroms

ED127 telescope (good condition) 3" 0.7x reducer from Explore Scientific (brand new) 2" Field flattener from Explore Scientific (good condition) 6...

The Lunt LS40FHa Double Stack Unit is intended for use with the Lunt 40mm Dedicated Hydrogen Alpha System and requires a Lunt Solar Systems Blocki...

The Lunt LS40Tha is a dedicated hydrogen-alpha solar telescope that provides exceptional resolution and contrast for solar observation and imaging...

100mm ED f/7 H-alpha refractor 700mm focal length Pressure tuning Supports B12...

The Lunt Solar Telescope LS50THa is a 50 mm h-alpha (Hydrogen Alpha Wavelength) f/7 dedicated telescope. Comes with a B600 Blocking Filter An in...

Featuring Best in Class Resolution and Professional Grade Optics Configuration Includes: LS60MT Telescope with Hydrogen Alpha Module Clamshell ...

In really good condition. Comes with double stack, original case, B1200 blocking filter, Lunt 19mm eyepiece and 1.25" night time diagonal from star...

Every astronomer should have at his disposition a detailed map of our only natural satellite: the Moon. Our map is based on thousands of images ...