Thank you Bill and Colin. I went ahead with DSS this morning and sure enough i could see degradation in the scores in the stack. I did the red channel first as i shot those first and half way through the scores started declining. When i looked at the final red channel stacked image i could clearly see a white fog in the middle of the image. Since the other colours were shot after that i have had to delete most of the subs. I think i finished up with about 25 red channel keepers. I will need to get the secondary heated before going back. Thanks
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