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04/29/2005 06:00:45 PM · #1 |
Has anyone figured out just how long of an exposure it will do? How about with a grip and 2 batteries? I assume if the battery goes dead during a multi-hour exposure you lose the entire photo? Here is an example of when a film cam has an advantage. A film camera would probably go for days.
Tim |
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04/29/2005 06:01:33 PM · #2 |
Only one that's fully manual.
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04/29/2005 06:07:42 PM · #3 |
| The limit is probably determined by sensor noise rather than battery life. While the 20D offers really clean long exposures and noise reduction, I suspect that an exposure of an hour or more would be unusable due to sensor noise. One of the few practical applications I can think of for such a long exposure would be astrophotography, but you're better off stacking multiple exposures in that case (or cranking up the ISO sensitivity). |
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04/29/2005 06:08:06 PM · #4 |
Hate it when I'm so dyslexic !!
Hey! I only have a few brain cells left and they're out to lunch. LOL
Message edited by author 2005-04-29 18:14:46. |
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04/29/2005 06:12:32 PM · #5 |
Originally posted by justine:
20D
This is about the best example I have of exposure time with that camera. |
One tiny problem. The shot wasn't taken with a Canon EOS 20D. |
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04/29/2005 11:31:06 PM · #6 |
I did a 2 hour test with my 20d. I opened the shutter then covered the lens with a lens cap. It didn't work at all. After I closed the shutter 2 hours or so later, it said "busy" like it was processing the image for another 2 hours. I finally had to pull the batteries out to reboot. The batteries held up but they are weak now. I'll test it again at a later date for an hour and see how that goes.
Tim |
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04/29/2005 11:49:12 PM · #7 |
| Depending on your menu settings it my do noise compensation, meaning it will take a 2nd shot with the shutter closed, for the same duration as the first shot, and subtract the two to remove the noise. So if you kept it open for 2 hours with that setting turned one, it would then say "busy" while it took a 2 hour exposure of the back of the shutter. |
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