I recently posted a picture of the California Nebula (NGC1499) that used special processing to overcome sharpness and noise issues in the oxygen and sulfur channels.  As promised, I have captured some much better frames of these channels.  And I did experiment with other ways of combining them make a color image, but didn’t find any that looked better than the original. So here is the final version, with 4 hours of H-alpha and 3 each of OIII and SII (10 hours total).  It is sharper than the previous attempt, and has better detail throughout.  But perhaps the most important […]