ZWO H-ALPHA 7nm NARROWBAND FILTER Size:1.25" Fully functional astrophotography software to

Fully functional astrophotography software to be used with EAGLE or Windows 10 computers

Ultra-low thermal expansion fused silica optics

Unlike the popular Quark filters

making it suitable for a wide range of mounts

The Baader M68 Male to M48 Male adapter has a male M68 x 1 thread on one side and a male M48 x 0

ZWO H-ALPHA 7nm NARROWBAND FILTER Size:1.25" Fully functional astrophotography software toThe 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,