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Hi Paul, what I was proposing was to do temp measurements only outside the tube (no-way I want to pierce my new babies either). Idea would be to plot/log outside tube temperature on several nights taking periodic avis and making and logging visual assessment of "seeing" through the scope at the same time. Then analysing this data to determine for how long a specific SCT needs to be left out with a given temperature gradient to obtain good imaging conditions - eg by looking at the profile of outside tube temp immediately before periods of good and bad imaging. It wouldn't be as precise as Birds stuff on newtonians, but after a few nights experimentation it should be possible at least to have a reasonable idea of whether imaging conditions are good or poor just by looking at the outside tube temperature profile.
cheers,
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