M16, The Eagle nebula. This image was taken using my 4 inch f/6.3 refractor, a Vixen Atlux mount, PHD auto guiding, an Atik 383L mono CCD camera and an Astronomik HA filter. I captured five minute sub frames with matching dark frames and combined them with flat field frames to reduce the effect of vignetting in the final image. The H-alpa luminance data had a total exposure time of 40 minutes whereas the colour data was taken from an old image taken two years ago with a ten inch f/4.8 reflector.
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Narrowband with the 4 inch refractor
Narrowband with colour from an old image taken with the 10" reflector
