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I have recently made a peltier powered external cooler and have been using it on the few clears nights we have had here in Mackay. Its quite warm here and and my camera has overheated on several occasions. With the cooler attached the sensor temp is definitely a bit cooler and temp is generally more stable. Because the cooler is at the bottom of the camera any condensation has been dripping away from the camera body and I have not noticed any internal condensation. My unit is salvaged from an el-cheapo drink can cooler, powered by a usb phone charger. The original pelitier module has been replaced with a larger 12v 60w unit. The heat sink and fan are too small to handle the extra heat generated when running at 12v but it works ok with the 5v usb power. It simply screws onto the tripod mount hole of the camera, slightly offset to still allow for battery changing.
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