Thanks Monte. I agree there probably would be a conflict of temperatures. I'm wondering if it's possible to put a dew strap a certain distance up the focuser shaft so the heat would travel down enough to warm the LPS filter (and stop the dew) but only minimally effect the CMOS which doesn’t directly touch the tube and sits a couple of inches further down? I've never used a dew strap (or any dew heater for that matter) so I don't really know anything about them. Are the dew straps temperature variable? Where can I buy them or is it possible to make them? They sound like they make life a lot easier and save the neighbours from the sound of a hair dryer at strange hours in the night
