Thanks guys! Yeah, this has significantly impacted the quality of data lately, and has caused me to not image numerous nights so it's a relief to finally isolate the primary cause.
After turning the fan off last night I saw some of the sharpest subs I've ever seen, with FWHM of L down to high 1.5" Of course transparency was rubbish and I got fogged out, but that's not a surprise here at this time of year.
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