Metal filter cell threads directly into the 2-inch barrel of your telescope eyepiece. Mounted in a nicely anodized housing.
The Alstar H-aplha cut-off filter enhances the contrast between object and sky, allowing you to take good quality images even under urban skies.
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.
With a bandpass of 12nm, only light above 660nm is allowed into your camera - whether under dark skies or under the sky glow of a city. That means the filter also blocks the infamous stray light and light from mercury and sodium vapour lamps.
Astrophotography under a light-polluted night sky can be difficult. The solution is an H-alpha filter. The Alstar H-alpha cut-off filter works to filter out a large part of this light pollution.
Alstar 2" Color/Planetary Filter for Telescope - #80A Blue
KWD 13.500
Alstar 2" Narrowband O-III Filter - Produces Near-Photographic Views of The Veil, Ring, Dumbbell and Orion Nebula, Among Many Other Objects
KWD 36
Alstar Guide Scope Mount - The Convenient Way to Mount Your Guide Scope
KWD 62
Alstar 1.25" Multiple 5-Position Filter Wheel for Telescope
KWD 21.500
