Question about long exposures

Discussion in 'Photography Beginners' Forum' started by Boz Mon, Jan 5, 2009.

  1. Boz Mon

    Boz Mon TPF Noob!

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    I posted a photo that I took on my D40 with a 15 minute exposure time the other day. Someone mentioned that the sensor would be hot after 15 minutes. Does this mean that I should not do more than 1 of these shots per day? Also, does it matter that it is cold outside when I am doing it?

    I have another shot going right now, I may post it up if it looks decent.
     
    Last edited: Jan 5, 2009
  2. Enem178

    Enem178 TPF Noob!

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    Why not post the one that you took the other day??? I want to see!!
     
  3. Dubious Drewski

    Dubious Drewski TPF Noob!

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    I've heard of people doing lots of long exposures, up to 30minutes with their camera and not having serious issues. Though you do start to get visual artifacts in your picture and I'm sure if you do it often, the heat will shorten the overall life of your sensor.

    There are some folks in my local photography club who do long exposures all the time and care little about the overheating aspect.

    But in my opinion, I wouldn't do more than 15 minutes at a time, and I'd give it equal downtime afterwards to cool down.
     
  4. Boz Mon

    Boz Mon TPF Noob!

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    [​IMG]
     
  5. Dubious Drewski

    Dubious Drewski TPF Noob!

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    Ooh! It's raining stars! Get inside!
     
  6. Boz Mon

    Boz Mon TPF Noob!

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    I adjusted my white balance on the one that I just did and the color is better but I was at 55mm instead of 18 so it doesnt look as good. In about 10 minutes I'm gonna give it another go..

    After I took the shot, it took about 15 minutes to process the image in the camera.
     
  7. TUX424

    TUX424 TPF Noob!

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    When the person said that your sensor may be "hot" i think they ment that everything would be overexposed not that it would be hot in temperture wise. To prevent that from happening you are going to want to use a very small aperture
     
  8. Clancyz

    Clancyz TPF Noob!

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    How do you prevent overexposure during daytime lengthy shots?
     
  9. Dubious Drewski

    Dubious Drewski TPF Noob!

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    No, we definitely mean hot, as in temperature. They do get very hot the longer you do an exposure.
    Well not necessarily. You could increase the shutter speed too. Or lower the ISO if it isn't at 100 already.
     
  10. j-digg

    j-digg TPF Noob!

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    Pretty new to photography, but I think for lengthy day shots people use neutral density ( ND ) filters to limit the amount of light that is brought in.
     
  11. Dubious Drewski

    Dubious Drewski TPF Noob!

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    If you know what a neutral density filter is, then you can't be that new :D

    This is your first post? Er, welcome to the forums!
     
  12. Boz Mon

    Boz Mon TPF Noob!

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    I have it stopped down to an f/5.6. I busted out the ole Pentax ME-Super for a bit too just to see what film can do in this situation. I'm gonna try some other shots tonight changing between film and digital (only because I have 1 tripod) and I'll post up my digital stuff later. May not be till the end of the week to see what the film does

    EDIT: Will the sensor get hot in the film camera? AND does the outside temp have any effects on the sensor temp?
     

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