Long exposures burning the sensor.

Discussion in 'Beyond the Basics' started by Ptyler22, Jul 21, 2009.

  1. Ptyler22

    Ptyler22 TPF Noob!

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    I have heard of people doing really long exposures and frying their sensors. How long could I do an exposure without risking overheating my sensor? and how long in between shots would I have to wait for it to cool down before I could do another? Any tips or help would be awesome!
     
  2. KmH

    KmH Helping photographers learn to fish Supporting Member

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    Not enough info......so, it depends.

    What camera (CMOS or CCD sensor), what ISO? What did your web search and TPF forum search turn up?

    I've only seen sensor overheating related to long term use of Live View in high ambient temperture environments.
     
    Last edited: Jul 21, 2009
  3. Ptyler22

    Ptyler22 TPF Noob!

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    OK, sorry, I should have included more info.

    Body Canon 40d
    ISO 100
    Outside temp 75F

    I searched the forum and got lots of similar questions but none that are quite the same, they are mostly about 20 or 30 minute exposures, but I just want to know what the longest exposure I can safely do is.
     
  4. KmH

    KmH Helping photographers learn to fish Supporting Member

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    It's going to vary with ambient temp and how hard the the sensor’s driving circuits must work at high frequency against the high capacitive load of any shift registers.

    Your 40D has a CMOS sensor which is better for thermal performance than CCD. The trouble is I don't know how Canon configures their electronics around their sensor.

    Hopefully, a Canon guy will chime in.
     
  5. Bravotwofive

    Bravotwofive TPF Noob!

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    If we have a Canon expert I would love to know the answer to this. Long exposures are a frequently used tool of mine. Some nights I can do upward of 50 or so, and relatively close together.
     
  6. musicaleCA

    musicaleCA TPF Noob!

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    Do you mean 50 seconds, or 50 minutes? :confused: (Or 50 exposures?)
     
  7. Bravotwofive

    Bravotwofive TPF Noob!

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    50 Exposures at 30 seconds to 2 minutes within 4 hours.
     
  8. Joves

    Joves No longer a newbie, moving up!

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    Well those should be fine.
     
  9. KmH

    KmH Helping photographers learn to fish Supporting Member

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    Something like star trails will take 15 minutes or more. I've done those with no apparent ill effects.
     
  10. Big

    Big TPF Noob!

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    Great question! I have been wondering this for my future photography!
     
  11. ddeerreekk

    ddeerreekk TPF Noob!

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    Anybody know what the answer to this question would be, if using a Sony camera? I'm using a sony a350, I never even considered this to be an issue - i didn't know that could happen.

    My camera is under extended warranty though and I'm sure it would be covered.
     
  12. dwol

    dwol TPF Noob!

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    The past few nights I have done star trails for at least an hour for each image (only two images taken per night, about an hour between each one), last night I did a two hour exposure and the camera is still alive lol.

    The temperature was around 20 degrees or 68 farenheit. Used a Canon 450D, ISO 100, F8. The camera body istelf was a little warm but nothing to worry about.

    The image itself did have some minute black spots like noise which im assuming is from the heat of the sensor. But I have been taking photos today and there is no problem with the camera. Hope that helps.
     
    Last edited: Jul 22, 2009

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