The Soap Bubble nebula

PN G75.5 1.7 The Soap Bubble Nebula. This is a very faint planetary nebula in the constellation of Cygnus the Swan. It lies near NGC6888 the Crescent nebula and was discovered in June 2008. Its low surface brightness is the reason why it was discovered so recently. I consider this planetary nebula to be very challenging for CCD imagers especially from a light polluted location. I took this image under clear, moonless sky conditions using my ten inch f/4.8 reflector, an Atik383L mono CCD camera with PHD auto guiding . 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 . Thetotal exposure times was sixty minutes using a H Alpha filter, forty minutes using an OIII filter and twenty minutes using a blue filter.