Cam
Wouldn't stretching require me to take more subs to fight the noise? I have no shutter cables or computer control so to take 60 exposures 10 seconds each I stand around pressing the shutter button every 10 seconds, 60 times. 60 frames is a major improvement over 19 for orion in terms of noise, even with orion mostly taken at half the ISO(does ISO affect noise?). If anyone else has the camera it would be great if they knew a simple way to take multiple exposures automatically. I think the high ISO did burn out the bright stars, most problematically aldebaran, it made it difficult to keep some remnant of colour. I'm not too worried about the faint detail as I see no nebulas there and stars aren't the most detailed of subjects. DXOmark.com seemed to say ISO 536 but I was confused by all the numbers and I may not have found the right one
Is it possible to take subs of many different exposures and ISO's to get both faint detail and bright star colours?
Raymo
Like you said, trial and error. I was playing around with a few different settings on the camera to see if they made a difference in image quality. From memory high ISO degraded faint extended objects like the milky way but I hadn't tried its effect on stars. It did let me see fainter stars but it made the background too light so I probably won't use a setting quite so high for the next wide field. What areas of the sky are interesting but tend to not get photographed much?
Could it help to to take darks, flats etc to get a smoother image?