18nm Narrowband Cuts Light Pollution Filter Astronomy Telescope Monocular Nebula

Description

Narrowband OIII filter is designed for nebula observation allowing 18nm bandwidth of light centered on a wavelength of 500nm through, which corresponds to OIII emission lines, and reducing the transmission of certain wavelengths of light, specifically those produced by artificial light including mercury vapor, and both high and low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e. skyglow).
OIII emits 496nm and 500nm and it is a blue-green colored filter. Many of images of planetary nebula and supernova remnants are taken only with H-alpha and OIII filters. They show great structural details, but have natural colors, looking like an RGB image.
Features:
Suitable for visual observation on most emission nebulae, planetary nebulae and supernova remnants
Suitable for viewing on bright nebulae like M42 Orion Nebula in heavy light pollution
Use with a large aperture telescope under clear and dark viewing conditions with good seeing
Narrowband filter do not eliminate the effects of light pollution or increase the object’s brightness. In many cases, they increase the contrast between nebula and night sky, not brightening the nebula.
WARNING
:
The filters are not designed for sun observation. DO NOT LOOK AT THE SUN WITH this FILTER. You would be BLIND if you fail to observe the warning.
Package Includes:
1 x SV115 2" filter