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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...

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 ...

This telescope has been opened, but returned just after reception due to its size. The client exchanged it for a smaller telescope that he could m...

In good condition, few cosmetic scratches. QHYCCD QHY268C Color with CFW 5 x 2" filter wheel. Comes with regular adapters, power supply and origin...

30-pound payload capacity handles most mid-range OTAs Includes Sky-Watcher SynScan WiFi adapter (no hand controller) German equatorial/Alt-Az/dual...

This telescope is a return from a client (due to size), it was assembled then dissassembled to ship it back to us. Comes with all original packagi...

In good condition, minor cosmetic damage on the dovetail and eyepieces/diagonal barrels The Sky-Watcher Skymax Maksutov-Cassegrains are the ultima...