After dodging clouds both thick and thin before the fog again, I managed to get enough data for this image.
Large image 3.8MB
http://members.optusnet.com.au/~trlee8/lagtr_100mos.jpg
Canon 5DH, 100ED, lpr filter.
2x(5x(1m, 2m, 4m, 8m)) at 200 ISO without ICNR. I managed to keep the fridge constant at -12C so used four darks for each exposure level.
The usual HDR method.
I am still not happy as I could have gone a lot deeper ie 16min exposures but the fog beat me. But at least there was a window in the cloud to test the fridge at constant temperature.
Bert