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Very close Gary and Allan. Dew forming on the window on the outside as Kevin from QSI seemed to think, when he wrote this yesterday.
"What we've seen when the dew point is very close to the ambient temperature (high relative humidity) is that radiative cooling from the sensor can temporarily lower the temperature of the window below the dew point. The camera body is a big heat sink designed to gently warm the window with heat from the TECs. In a short amount of time, perhaps 30 minutes, the window will be warmed above ambient temperature and therefore the dew point."
His suggestion is to start cooling about 1/2 an hour or so before imaging and slightly have the set point higher for a bit then go down to the desired temp.
Dew at present is at its best (meaning full on) so this is the reason for the problem. So I don't need to do the desicant just yet as the argon gas should last another year or so yet.
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