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Steve if you have the supplied desicant heater from QHY use that it works well. When I had one I used to take the nose piece off the camera and place it chip down in the case. It was then a simple matter to heat and dry the crystals and place that in the box closing the whole lot up for about and hour. Put it back together as soon as you open the case (in a dry environment) and hey presto it's done. I used to do this regularly and never had a problem with dew although Perth is pretty dry most of the year. I think Theo is selling a dedicated dew heater for the QHY8 for people living in areas that have high humidity. Either that or you can give your own a bit more oomph. As Mill said the 9's have them on board and mine has only ever fogged up once when maxim went mad and applied full power to the peltiers at startup. Camera got to about -35 in less then a minute and the chip iced up. Teach me not to keep my eye on things.
Mark
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