Re: Lens condensation question


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.

.

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