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Jellyfish redux. Did some more processing, eliminated a few blurred frames. 3 hr. 15 min. total exposure time through 35nm. Baader H-Alpha filter, 11" Celestron NS in Hyperstar3 configuration working at f/2. QHY10 CCD at -15C, no darks.

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Comment by Ian G on March 12, 2012 at 6:05am

Thank you, William. With this camera I am not using Darks. Set it for -15 and use dithering, it seems to be enough. Have to use Flats, though. I had some more time this weekend to shot same object (did 20 min. subs - the longest for me so far!). Hopefully will get more detail. Stay tuned!

Comment by William Neff on March 10, 2012 at 6:54am

Sharp image, NO darks subtract? I expanded image 200%, very sharp stars, good focus and tracking.

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