I continue with the North America nebula for three hours last night. Here's the end result.
The image was taken with a narrowband filter that only passes light emitted by hydrogen glowing at a certain wavelength when exposed to the harsh ultraviolet radiation from nearby stars.
With narrowband filters it is possible to separate different elements from each other, and also - maybe more importantly - get rid of most of light pollution.
@naavis These are amazing.
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