Taken with 300mm F2.8L lens. Seven exposure levels from 7sec at 200 ISO to 2 min at 800 ISO all at f/2.8. Converted from Raw to Tiff and corrected for flats with ImagesPlus.Stacked and aligned with Registar. Used EasyHDR to produce final image.
All exposures taken with camera in fridge at -8.0 C at an ambient of 17 C. Used the fridge mark III with two Peltiers and two heat sinks. It easily gets 25+C below ambient even with the heat load of the camera taking long exposures.
More on the fridge in ATM etc.
Large image 2.0MB
http://members.optusnet.com.au/~cheekyfish/NGC3766.jpg
Bert