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Alex I have not found frosting the sensor to be a problem. The sensor generates some heat, which the cold finger removes. Condensation is more likely on the front anti-alysing filter if you have left it in place, or any clear replacement that fits the holder frame - like the Astronomics ones. Rowland has heated his to control that, and I use Argon to control it in mine - either way can work. I am no where near Rowland's electronic and software capability so I rely on simpler external control system that anyone can put together and it requires no software. If you follow Rowland's cold finger template it will fit. Nothng ventured nothing gained - or lost in relation to heat. 'You can do it Bennant' to quote Arnie. We're here to help as well.
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