ZWO H-ALPHA 7nm NARROWBAND FILTER Size:1.25" 5-4nm SHO filters or Antlia

5-4nm SHO filters or Antlia 50 x 50mm square LRGB & 3nm SHO filters

AM5N and the pier extension PE200

Unlike the popular Quark filters

when doing alignment)

Prima Luce Lab offers a large variety of adapters with different male threads:

ZWO H-ALPHA 7nm NARROWBAND FILTER Size:1.25" 5-4nm SHO filters or AntliaThe ZWO 7nm H alpha narrowband filter enhances the contrast of emission and planetary nebulae. These peculiar nebulae emit light only in specific wavelengths (H; OIII; SII) and the narrowband filters have the property to reject all light outside these bands. The passing band or "window" of these filters is 7nm wide. Considering that the visible light spectrum is between 380nm and 740nm, a 7nm filter would block 98% of the unwanted light. As a result,