06-30-2014 06:39 PM
07-02-2014 02:58 PM
@cale_kat wrote:TCampbell writes, "...put the camera in front of an AC vent..."
Please, OP, do not do this! It is a recipe for disaster because cooling the outside of the camera could lead to condensation internally. This is very bad advice.
AC is very dry air (condensation collects on the evaporator coils and drips off ... drying the air.) We deliberately blow AC through the racks in datacenters. No condensation problems.
If you left the camera in the refridgerator or freezer and THEN walked in to a an environment with warm, moist air... that would be a problem. Warm moist air wants to condense on cold surfaces. Cold air does not want to condense on warm surfaces (and the sensor WILL be warm.)
For astro-imaging... we actually have chillers on the cameras (physically cold sensors result in much lower noise levels. The coolers will typically drop the sensor temps by about 25-40ºC depending on the imaging camera.) When we're done with those cameras, however, we don't just switch them off. We switch off the cooler but leave the fan running for about 5 minutes to break them back up to ambient temps.
07-02-2014 03:07 PM
AC is dry air but that doesn't mean that the air inside the camera has adjusted to the ambient temperature or humidty. Exposing the camera to rapid temperature changes is explicitly warned against in my Canon Instruction Manual. They mention moving from cold to warm and I mention from warm to cold.
07-02-2014 11:37 PM
@cale_kat wrote:AC is dry air but that doesn't mean that the air inside the camera has adjusted to the ambient temperature or humidty. Exposing the camera to rapid temperature changes is explicitly warned against in my Canon Instruction Manual. They mention moving from cold to warm and I mention from warm to cold.
The air temp out of an AC vent isn't that cold... about 60ºF. Also... going from warm to cold is never a problem (that's physics). Going from cold to warm+moist can cause condesnation if the surface temperature of the item drops below the dew point.
You can always check the dewpoint at any weather site.
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