CHROMA TECHNOLOGY H-ALPHA FILTER Size:50mm square any 12V DC source using

any 12V DC source using the supplied EFA to 5

particularly with Newtonian reflectors and in windy conditions

Nebulae have a strong emission on the band of the hydrogen (H𝛼)

so you can put double polarizing filters

Female M42 x 0

CHROMA TECHNOLOGY H-ALPHA FILTER Size:50mm square any 12V DC source usingChroma narrowband filters are the highest performing filters on the market today. They are available with a range of bandpasses and sizes to suit any configuration where the finest image quality is of paramount importance. H alpha filters are essential for imaging nebulae and other objects which are rich in ionized hydrogen. At 656. 3nm, a narrow band emission filter is required to separate H alpha from the SII doublet (671. 6nm and 673. 1nm). All