CHROMA TECHNOLOGY H-ALPHA FILTER Size:50mm square Nebulae have a strong emission

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

so you can put double polarizing filters

This allows to connect two telescopes in parallel with the advantage to lower the barycenter and therefore reduce the counterweights needed

SkyWatcher EQ6-R mount

After H-alpha

CHROMA TECHNOLOGY H-ALPHA FILTER Size:50mm square Nebulae have a strong emissionChroma 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