NGC6888 the Crescent nebula and PNG75.5+ 51.7 the Soap Bubble nebula. I consider this as a very challenging target because of its low surface brightness. It was first discovered in June 2007 from the Mount Wilson Observatory in California using a six inch refractor, a CCD camera and a H Alpha filter. I took this image on four separate evenings with no moon light to contend with under very clear sky conditions. Stars were visible down to magnitude five. The telescope was using was a 4 inch f/6.3 refractor on a Vixen Atlux mount, PHD auto guiding, an Atik 383L mono CCD camera and Astronomik filters, H Alpha , O111 for the luminance data. I also used RGB filters to reveal the colours of the stars. 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 total exposure times were four hours for each narrowband filter, H Alpha and O111, and ten minutes for each RGB filter.
Click on an image to get a closer view
Hubble palette
Hubble palette + RGB
RGB colour narrowband luminance
Soap bubble super enhanced
