The Crescent Nebula, NGC6888, is on the cover of September's Sky & Telescope. I wanted to see what I could do from the backyard. I also wanted to try out a new Vixen focal reducer designed for use with the R135S. With the focal reducer, I am imaging at f/4.8. That's still 648mm, but faster than the images at f/5.3, stacked below, of M57. This image of the Crescent is about 38 minutes worth of 8-second, unguided images, stacked and stretched in Registax. It is not as deep as I'd like. I thought I'd see more of the nebula. Perhaps under darker skies, or with an Ha filter. Next time, maybe.
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