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08/14/2005 06:58:02 PM · #26 |
Originally posted by GeneralE:
The "play" between ambient temp and dewpoint is probably not enough to make a significant difference in image quality, especially when you factor in the additional noise and power drain likely to be involved.
You can try sticking you camera in a plastic bag (maybe with some dessicant packets) and keeping it in an ice chest as you drive around -- why not make some tests? |
Nice idea but dunno about "as you drive around" - presumably you'd have to take it out of to shoot, hence exposing it to warmer air... condensation ahoy, even if it's still in the plastic bag. No amount of dessicant on the outside will stop a stray warm air current filling the inside with water :)
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08/14/2005 07:01:48 PM · #27 |
| If you have a remote, maybe you can keep the camera packed in some of those gel-ice bags (chilled but not frozen) and operate it with the remote. |
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08/14/2005 07:08:11 PM · #28 |
Originally posted by GeneralE:
If you have a remote, maybe you can keep the camera packed in some of those gel-ice bags (chilled but not frozen) and operate it with the remote. |
That's another nice idea... but wouldn't be much good for real-world tests, unless you really like macros of the inside of gel-ice bags :D
Bah, all this could be made so much simpler if you could hermetically seal the sensor chamber and the back of the lens... then just dehumidify the air in it (or even better, have a vacuum) and never worry about condensation. Supercooled sensor :D
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08/14/2005 07:30:52 PM · #29 |
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08/14/2005 07:54:34 PM · #30 |
Bear in mind that thermally generated noise is an exponential function of temperature. The typical Peltier cooler will have a delta T of 40 degrees Celsius which can make a significant difference in image noise and still be above the dew point (in low humidity areas). However, I have not yet seen a consumer grade camera that employs cooling, though many astrocams have this feature. Consumer grade cameras will always exhibit higher noise levels at elevated temperatures, say from being stored in a hot automobile, and noticeably lower noise when kept cool.
It is not usually practical to employ artificial cooling and most of just live with the noise and reduce the effect in post processing. Shoot with as low an ISO as practical for the light conditions!
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