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Great work there Bert. I must try the HDR process, as currently I just mask a bright burnt in image, with a dark one showing only the bright parts, in order to get a shot that shows faint outer areas and bright regions fully, using Goussian Blur on the mask. It is a bit hit and miss though, sometimes having to have a few trys at it to get an acceptable image, so the HDR process might be the go.
Yes the advantage of peltier cooling is not just less noise, but control. Taking the dark frames and light frames all at the same temperature ensures very accurate dark subtraction and thus more boise free images. With Houghys cooled DSLR I would slowly back off the cooling as the night wore on to try to keep the sensor temp the same throughout.
Scott
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