Had a reasonable night until the fog started to form. I managed to collect enough data for this.
Large image 2.0 MB.
http://members.optusnet.com.au/~trlee8/corA_ehdr07.jpg
Details
Canon 5DH, Canon 300mm F2.8L at f/2.8, 20x1 min, 8x4 min, 6x16 min, at an ISO of 500, ambient temperature 8 deg C at start 2 deg C at finish. Fridge temperature -11 deg C. No sign of condensation yet.
Used Images Plus and RegiStar to produce three stacked images at each exposure level and used EasyHDR to produce an LDR TIFF.
Bert