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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 is present in emission nebula.

The next filter to complement your LRGBH-a set is an oxygen filter. OIII (“ohthree”) emits light near 500 nm and is a blue-green- or teal-colored filter. Many of my images of planetary nebula and supernova remnants are taken only with H-a and OIII filters.

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 filter to consider adding to your collection after H-a and OIII is the SII.

The EFW3 7 Position electronic filter wheel for large format cameras can be ordered with the ability to either carry up to 7×50.8mm unmounted or 7×2” mounted round filters, housing LRGB and Ha, OIII and SII filter sets in the same carousel

High quality 2.5" 6 digit sidereal clock by BRG Precision including the GPS Atomic Time Receiver. One of the leadest manufacturers of sidereal and other precision clocks.

The Celestron C5 Spotting Scope offers a 5" (127mm) aperture, 1250 mm f/10 Schmidt-Cassegrain optical system. The high optical excellence is the reason NASA used this telescope for several space shuttle missions.

The C5 spotting scope is an ideal choice for the serious bird watcher, nature lover or anyone who enjoys beautiful views from their home or in the field. At just six pounds in weight and 11 inches in length, this spotting scope is a portable visual and photographic instrument with a wide variety of optional accessories to expand it's capabilities.

Celestron’s signature orange-tube telescope combines advanced features and excellent optics in one easy-to-use system, the NexStar 4SE. It’s the perfect choice for your first serious telescope, offering striking views at an economical price.

Work smarter, not harder, when it comes to combating dew. The Smart DewHeater and Power Controller 4X prolongs your battery life by optimizing power usage for up to four dew heaters.

The new high-end Helios LIGHTQUEST-HR observation binoculars combine top features in mechanical and optical design, with outstanding performance to match!

iOptron's new ultra compact EQ/AZ GoTo mount -- introducing The SkyHunter!
Fifteen years after releasing the innovational CubeTM AZ/EQ GoTo mount, the SkyHunter takes the next step toward perfection.

GENESIS.
Trust Your Eyes with GENESIS PROMINAR

KOWA TE-80XW Extreme wide eyepiece

We are proud to announce our brand new HD heavy duty pier ideal for observatories. Made from a very heavy duty steel construction with castellated vibration reducing fins for ultra stability.

The compact Sky-Watcher STARTRAVEL series are two-element, air-spaced, multi-coated objective, achromatic refractors, and are well proven performers for “Rich-Field” views of star fields, clusters, nebulae, bright galaxies, planets, the Moon and, the Sun (with correct safety filtering!), as well as giving excellent terrestrial views.

The LS130MT/B3400 telescopes can be upgraded with this conversion kit. This allows to explore the Sun at different wavelengths with one and the same telescope.

​Field-flattener and focal length reducer for deep-sky astrophotography. Designed for the multipurpose APO telescopes of the Lunt-Solar-Systems LS80MT, LS100MT and LS130MT series.