The addition of a 3nm Astrodon Hyrdogen Alpha filter to my QSI CCD was a fantastic additinon to my toolset. The great beauty of this wavelength is that it's imprevious to suburban light pollution, and more or less immune to moonlight. Over time I've acquired more cameras and more narrowband filters of different wavelengths and band passes (the wider Ha filters are affected by Moonlight... btw). I love shooting narroband as the images tend to be very high contrast and show details often missed ...

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