A&P noise on night shot v. long exposure

Discussion in 'Lifestyle' started by frostedfrank, Jan 17, 2008.

  1. frostedfrank

    frostedfrank OT Supporter

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    is it normal to have a noisy picture with long exposures? Was a night picture, shot at:
    ISO 200
    30sec
    F/3.5

    shot with XT in raw.
    so yeah, picture is kinda noisy just wondering what I did wrong. I am still experimenting so input would be nice.
    resized quite a bit but can still see the noise.

    [​IMG]
     
  2. JordanClarkson

    JordanClarkson OT Supporter

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    you'll get more noise in the underexposed parts. bracketing with hdr can help
     
  3. frostedfrank

    frostedfrank OT Supporter

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    thank you
     
  4. disgusting

    disgusting is this a girl or a guy? b/c i got a hard on OT Supporter

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    ok unrelated but why shoot that at ISO 200?
    why not shoot at higher ISO and shorter exposure?
     
  5. Derrict

    Derrict No, I am not Amish OT Supporter

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    if you've had your camera on for a long time, the heat on the sensor can also add noise.
     
  6. turbodude

    turbodude Just a photographer OT Supporter

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    Did you bump the exposure at all in post?
     
  7. FusionZ06

    FusionZ06 /\__/\__/\__0>

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    Use the NR long exposure mode if available on your camera. It will reduce the heatup as well as the fuzzy purple or weird hue that can sometimes happen in addition to the noise.
     
  8. frostedfrank

    frostedfrank OT Supporter

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    actually I think the one I posted I tried to play with in PS. but yeah question would have been the same
     
  9. frostedfrank

    frostedfrank OT Supporter

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    was doing some tests, and hard to see on the lcd what the picture looked like. I was thinking lower ISO=less noise but I guess when there really isn't enough light perhaps 400-800 would have been fine?

    I'm just a noob playing around
     
  10. frostedfrank

    frostedfrank OT Supporter

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    I'll have to look into that. Don't know if the XT has that option
     
  11. brasheye

    brasheye Rotary Crew

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    A friend of mine who does a lot of astro shit actually carries some compressed air in a can and sprays his camera while it's exposing :bowrofl:

    It works :hs:
     
  12. frostedfrank

    frostedfrank OT Supporter

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    but I mean about camera getting hot. this picture was taken at night, about -15, -20°C so roughly 0°F. I wouldn't think heat would be an issue?
     
  13. brasheye

    brasheye Rotary Crew

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    when the weather gets to 15°C in Aus people die :eek5:
     
  14. mobbarley

    mobbarley Active Member

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    stick to 100 if you can.. well, if you are setting up on a tripod and taking a photo something that doesn't move there is really no reason not to. try taking the photo before it gets completely dark, just before it becomes completely black for the night.. the photos have great colour.
     
  15. Derrict

    Derrict No, I am not Amish OT Supporter

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    the sensor still generates heat.

    does your engine stay cold in the winter after it's been running for 15 minutes?
     
  16. tenxia

    tenxia OT Supporter

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    I don't see the noise? Is it my eyes?

    anyway, u shooting on a tripod right?
     
  17. frostedfrank

    frostedfrank OT Supporter

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    Good point. So what do people do when they take pictures with 5-10mins exposure?
     
  18. frostedfrank

    frostedfrank OT Supporter

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    yes had tripod
     
  19. Derrict

    Derrict No, I am not Amish OT Supporter

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    Upgrade to a full frame body :rofl: j/k

    Leave the camera body off when it's not in use.
     
  20. NJGuy

    NJGuy "Fuckmefuckmefuckmefuckmef uckmefuckmefuckmefuckm OT Supporter

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    They use film
     

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