Thought I would push the envelope with the CDS1100D last night, and set the ISO to 6400. I'm totally stoked at the results.
I only had time to collect 9 x 5min subs before it went behind a tree.
ED127, CDS1100D, DSS, CS3
I do love these newer "low noise at high iso cameras". My Pentax K-30 is the same - it's hard to believe it's high iso when you see the picutre. And your fanatastic image is the same - hard to believe it's at such a high iso!!