Re: Lens condensation question

"cjcampbell" <christophercampbell@xxxxxxxxxxx> wrote in message
news:1137384577.989327.272340@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>
> Floyd Davidson wrote:
>> >
>> >Helps too to suck the air out of the bag.
>>
>> The biggest trouble with that is you can't get all of the air
>> out, and that inside air is loaded with moisture, in the bag.
>
> Cold air is usually drier than warm air, which is why condensation
> occurs in the first place. The cold lens cools the air around it
> sufficiently to force the water in the air to condense out of the air
> onto any surface, including the lens. Since warm air holds more
> moisture than cold air then the cold dry air inside the bag cannot have
> moisture forced out of it by warming it; if anything it will absorb
> water out of the camera. Once warmed, the camera will not cool the
> warm, moisture laden air around it, so no condensation.
>
> At best, sucking the air out of the bag does not help; at worst you
> might introduce more moisture into the bag by breathing into it and
> there is less warm air for any water on the camera to evaporate into.
>
You don't live in SoCal, do you? Heheh, hot and dry, cold and wet aren't
clichés around here.

--
Skip Middleton
http://www.shadowcatcherimagery.com


.

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