These filters allow maximum transmission of the important wavelengths of H-alpha, H-beta and doubly ionized oxygen - the ones most commonly emitted by nebulae.
Views of galaxies and star clusters are also enhanced, but to a lesser degree. Also improves contrast on reddish planetary detail. Works well in telescopes of all apertures but is highly recommended for use on smaller telescopes where narrower band filters are less suitable and swallow up too much light. Supplied with storage case and simply screws into any 2" eyepiece or accessory with a standard filter thread.
Very impressed For what seems to be a budget filter compared to others on the market, it has produced very impressive results for both viewing and photography. (19/12/2018) Ewan -
Excellent filter with an excellent price to match! I've used this filter for a couple of sessions now, mainly using my ethos 13mm and Explore Scientific 20mm 100d. I have to be honest whichever ep I'm using this filter stays in, there's a noticeably darker background stars are better defined and that glow is completely gone. Great service as well. (21/07/2017) Richard Hather - Bury
Helping to observe in light pollutiion Without the filter the light pollution stopped observation of m42. With the filter i could see good details (17/03/2017) Neil Clark - Durham
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