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Working with Hydrogen-alpha data, part 1

July 2011: Great results come to imagers who take the narrow path.
Luminance-image
Combining a luminance image with one you took through a Hydrogen-alpha filter delivers impressive results, as in this example of NGC 2237-9 and NGC 2244.
Tony Hallas

It doesn’t take long before an astroimager hears about a seemingly exotic technique called narrowband imaging.

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