Optolong Astronomy Filter - Andromeda is the nearest major galaxy to our own Milky Way Galaxy but it takes about two million years for light to reach us from there. The diffuse
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M31 with OSC & LP filter - Experienced Deep Sky Imaging - Cloudy Nights
What Does an LRGB Telescope Filter Do? | Astronomy.com
Imaging the Andromeda Galaxy under Light Polluted Skies – Professor Morison's Astronomy Digest