Telescopes & Astronomy

Enhances:

• Lunar detail
• Polar ice caps of Mars in large telescopes
• Polar regions on Saturn
• Limb hazes and terminator clouds of Mars
• Clouds and atmospheric haze on Venus, reduces glare

Adding the ZWO O-III Narrowband filter to your imaging collection will help you go beyond RGB imaging and capture your favorite nebulae in a totally new light, no matter how polluted your skies may be!

• Fits Optical Tube Diameter 7 1/8" (181mm) to 7 3/8" (187mm)
• Safe for viewing the Sun
• Blocks 99.999% of incoming light
• Compatibility: LX70 R6, LX65 6" MAK & 6" ACF™, LX85 6" MAK, ACF™ & 6" Reflector 

• Fits Optical Tube Diameter 11 5/8" (295mm) to 11 7/8" (302mm)
• Safe for viewing the Sun
• Blocks 99.999% of incoming light
• Compatibility: LX90 10", LX200 10", LX600 10"

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The ZWO narrowband O-III 7nm filter is designed for nebula observation allowing 7nm bandwidth of light centered on a wavelength of 500nm through,  which corresponds to OIII emission lines, blocking out all other light.  Adding the ZWO O-III Narrowband filter to your imaging collection will help you go beyond the RGB imaging and will help capture your favorite nebulas in a totally new light, no matter how polluted your skies may be!

The ZWO 7nm OIII filter is centered around the Oxygen III band of 501nm. Oxygen III or double ionised oxygen occurs at  primarily at 500.7nm and secondarily 495.9nm.  The highest levels of OIII are usually found in diffuse and planetary nebulae. The OIII emission lines were first discovered in the 1860s in spectra of planetary nebulae.  OIII wavelengths relate to the green-turquoise-cyan in colour on the spectrum whilst the narrowband width makes the background space very black.

Astrodon 5nm Narrowband Filters – H-alpha 5nm

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 (North American, Pelican), planetary nebula (Dumbbell, Ring), Wolf-Rayet objects (Crescent, Thor’s Helmet) and supernova remnants (Veil).