Hi Peter- I use the 2600MC and ASIAIR and can generally get the full -35deg but the cooler is running pretty hard to do it - at least 90%. There's a few summer nights here above 25C where I can't get to -10C and have to settle on -5C. There seems to be a glitch with my camera where if the cooler maxes out to 100% it just stops cooling altogether and I need to turn the cooler off and on again to reset. This messed up my last image of the Christmas Tree Cluster actually.
I should mention that air-flow and humidity also seems to have an effect. For instance, when I'm using the hyperstar and the camera is inside the dewshield it needs to work harder to cool.
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