I was looking at some unprocessed data recently (Oct 5, 2014) and found this set of 40 sub-images taken at ISO 6400. It was a batch of 60 second subs, so only 40 minutes worth of integration. It came out surprisingly well for just 40 minutes. I’ll have to try some more with that setting and see if I can get some dimmer nebulae.
This is a supernova remnant in Cygnus. I took this with a GSO 8″ Newtonian that I was testing. I used ISO 3200 Speed on a Canon T3 DSLR camera that has been modified for astrophotography.
Images of Comets, Nebulae, Galaxies and Star Clusters