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Número de artículo:275528648077Skywatcher 2'' OIII / O-III Narrowband Deep Sky Nebula Filter #20196. Skywatcher 2'' OIII / O-III narrowband deep sky nebula filter #20196 The O-III narrowband filter is specially designed for the observation of gas and planetary nebulae. It
distinguishes different contrasts of the wavelengths of light that pass
through, giving ideal conditions for the observation of faint super
nova remnants and planetary remnants. The O-III narrow band-pass
filter isolates just the two doubly ionized oxygen lines (496 and 501nm)
emitted by diffuse, planetary and extremely faint nebulae. O-III
filters work ideally with larger aperture telescopes in the 200mm and
larger range. With larger aperture telescopes, observers will have a
better opportunity to identify nebulae objects in the deep sky. It can
produce near-photographic views of the Veil, Ring, Dumbbell, Orion, plus
many other nebulae under dark skies. There is a very small hairline scratch to the coating - it is unlikely to cause optical issues.