Quote:
Originally Posted by gregbradley
Great shot Gordon.
Tremendous detail in the neb itself. With this chip in particular and the 694 as well you have to change your exposure strategy as the camera has quite small wells plus its 66% QE in Ha and about 60%+ in O111.
So perhaps even 5 minute subs may have been appropriate to stop the star bloat on overexposed bright stars. The low read noise means there is no liability.
Greg.
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Hi Greg
Thanks for the comments, that is a good point about the well size and sensitivity, the chip is the 814 by the way and not the 694 so the pixels at 3.69 are even smaller than the 4.54 of the 694. The Elephant trunk I shot with 10 minute subs at 2x2 binning and the stars did suffer a bit, I may try some 5 minute subs as you said to see the difference. Interestingly I shot a 10 minute 2x2 binned sub with luminance of the Iris nebula and it was so over saturated due to the bright core that it didn't even register!
Best wishes
Gordon