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CMOS long exposure and heat accumlation

I am going to test a pinhole in my new Canon 20 D. I would like to use long time exposures (5, 10 minutes, may be more), but I am affraid this could be dangerous for the CMOS sensor (because heat acccumulation). I wonder if you knows something about this, or if you trying to do something like that.

Fernando Boro
Sun, 13 Mar 2005 10:48:34 -0300 (ART)

The author in "Manually Guided DSLR Astrophotography" mentioned he was able to do 4 to 5 minutes exposures consistently without any problem.

I would think that Canon would have place safety circuits in the camera to prevent thermo burn-out . . . or they should at least warn the user of that possibility in the manual, which I haven't seen.

I think you would have more problem with noise generated on the CMOS sensor due to heat, than the heat being dangerous to the sensor. I have read that some users places their camera in the refrigerator over night to chill the sensor for astrophotography. I can't find any relevant links right now . . .

Chieh Cheng
Mon Mar 14 09:29:51 PST 2005

Thanks for your reponse. I was doing some research by internet and all people says that: noise generated by heat it seems THE issue in long exposures with digital 35mm cameras.

In the other hand, the digital backs like PhaseOne P25 (22 megapixels) for medium format and view cameras shutdown itself if you surpasses the limit of 30 seconds, in order to prevent damages to CCD sensor by generated heat.

Thanks again.

Fernando Boro
Mon, 14 Mar 2005 15:29:47 -0300 (ART)

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