Astromania 1.25-Inch 6/12.5/20mm Plossl Telescope Eyepiece Set - Bundle with - 1.25" NBPF Hydrogen-a 12nm Filter

Astromania 1.25" Narrowband NBPF Hydrogen-a 12nm Filter. Astrophotography under a light-polluted night sky can be difficult. The solution is an H-alpha filter. The Astromania H-alpha cut-off filter works to filter out a large part of this light pollution. This convenient filter only allows 12nm bandwidth of light centered on a wavelength of 656nm to pass through, which means it blocks a large part of the scattered light and also blocks the light from artificial mercury and sodium-vapour lamps. Young stars embedded in the bright red of a nebula - an H-alpha filter is the expert if you want to capture hydrogen nebulae in all their glory. The Astromania H-aplha cut-off filter enhances the contrast between object and sky, allowing you to take good quality images even under urban skies. Metal filter cell threads directly into the 1.25-inch barrel of your telescope eyepiece. Mounted in a nicely anodized housing.

• Astrophotography under a light-polluted night sky can be difficult; the solution is an H-alpha filter; the Astromania H-alpha cut-off filter works to filter out a large part of this light pollution
• Allowing 12 nm bandwidth of light centered on a wavelength of 656 nm to pass through; 90 percent transmission at H-alpha line 656 nm; that means the filter also blocks the infamous stray light and light from mercury and sodium vapour lamps
• Young stars embedded in the bright red of a nebula: an H-alpha filter is the expert if you want to capture hydrogen nebulae in all their glory
• 1.25 inch plossl eyepiece set: 6mm 12.5mm 20mm; gives the widest viewing field along with extra sharpness and long eye relief
• 4-element plossl design has a approx 50 degree AFOV; perfect for broad-field lunar observations and medium-sized star clusters and a wide range of cloudy nebulas and deep-sky targets