Detailed description coming soon.
Aug 21, 2017
Excellent FilterPros: Cons: Comments:
I purchased this 12nm H-a filter for use with a night vision monocular to reveal the myriad nebulae in the Milky Way at 1x, 3x, and 14x at my semi-dark site. It provides a spectacular image of H-a emission lines allowing direct vision (similar to photographic quality images) of the Lagoon, Eagle, Cats Paw, North American, Pelican and many other very large nebulae. I'm very happy with this filter used for this purpose at my dark site (commonly having magnitude 5.5 skies). Even from my light polluted city, this filter helps to see these same nebulae, but either my 7nm or 5nm H-a filters are better under light polluted skies. But at the dark site, the 12nm provides a cleaner image with stars that are not attenuated like the 5 & 7nm filters. This filter also has a thinner housing (lower height profile) than some, allowing use in all filter wheels. Very satisfactory performance, excellent quality, no visible defects in the ion deposition coatings which seem very sturdy (I've cleaned it twice). Highly recommended for this type of observing.
This review was provided courtesy of AgenaAstro.comSort by