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12/03/2005 09:37:13 PM · #1 |
My D100 is capturing a whole lot of hot pixels in long exposure shots. I can easily see 50+ distinct distortions which ought not to be there. See an example here (30 second, ISO 200) .
I've always wanted to do astro-photography but that's not going to work well if my camera is tossing in that many of its own 'stars'.
Is this abnormal? If so, what is the fix? |
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12/03/2005 09:52:03 PM · #2 |
Depends on how old you camera is. If it's brand new (less than 30 days) you might get help form your reseller or Nikon.
If it's older what you should do is send the camera in to Nikon and they will remap the pixels to help eliminate this.
Cameras get hot pixels and dead pixels all the time. The older your camera gets, the more you will see. That happens with all digital cameras, nothing special to one manufacturer
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12/03/2005 09:54:25 PM · #3 |
This often happens on longer exposures.
Try dark frame subtraction.
Take your long exposure shot as normal. The immediately afterwards, and without changing the camera settings, put the lens-cap on and take a second shot. Which will be all black apart from the hot pixels.
Then in Photoshop, put the two frames as two layers and set the blend mode to 'Difference'. Adjust the opacity until you can't see the hot pixels anymore. |
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