File :-(, x, )
Anonymous
Whats Wrong with my camera? Why are there red, green and blue dots on my ~5min exposure?
EXIF data available. Clickhereto show/hide.
Camera-Specific Properties:Equipment MakeNIKON CORPORATIONCamera ModelNIKON D90Camera SoftwareAdobe Photoshop CS2 WindowsMaximum Lens Aperturef/4.4Sensing MethodOne-Chip Color AreaColor Filter Array Pattern970Focal Length (35mm Equiv)52 mmImage-Specific Properties:Image OrientationTop, Left-HandHorizontal Resolution300 dpiVertical Resolution300 dpiImage Created2008:11:20 00:47:12White Point Chromaticity0.3Exposure Time403.8 secF-Numberf/22.0Exposure ProgramManualExposure Bias0 EVMetering ModePatternLight SourceUnknownFlashNo FlashFocal Length35.00 mmColor Space InformationUncalibratedImage Width2144Image Height1424RenderingNormalExposure ModeManualWhite BalanceAutoScene Capture TypeStandardGain ControlNoneContrastNormalSaturationNormalSharpnessNormalSubject Distance RangeUnknown
>> Anonymous
http://letmegooglethatforyou.com/?q=dead+pixels
>> Anonymous
I didn't run job nr I just turned it off while it was going. Did this happen because I didn't let it run or is there something wrong with my camera?
>> Anonymous
     File :-(, x)
>> anonymous
Noisy pixels. It's not broken, it's just shitty.
>> Anonymous
As said, hot pixels and/or noise.

If you're worried about not being able to make photographs like this, create a 2114x1424 image in Photoshop or GIMP and use the "Bucket" tool to fill the area with pure black. It's much faster and easier than using your camera, and gives the same result.

Otherwise, don't worry about it if you can't reproduce it under normal circumstances.
>> Anonymous
On a D90? Ouch.
My D80 has lots, but it's almost two years old.
>> Pro photographer
Nice macro of the inside of your lenscover.
You should submit this to a stock library, you could make money like me.
Big time bro.
>> Anonymous
>>297241
If your camera has long exposure noise reduction, enable it. It will take a second frame at the same exposure with shutter closed and then use it to eliminate hot pixels.

You can also do that manually. Take two shots every time, one normal and one with lens cap closed, then subtract the second from the first in photoshop.
>> Anonymous
This might help: http://www.pixelfixer.org/

I get a few hot pixels at ISO 400+, no matter what the speed is. Long exposure NR only kicks in after a few second long exposure. You may need to make your own lens cap frame for each ISO/exposure duration to use with pixelfixer though.
>> Anonymous
So is my camera messed up or does this happen with all D90s? Also this is an image of the stars. If you look closely you can see the trails of a few stars.
>> Anonymous
>>297241
you're a fucking nigger.
>> Anonymous
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>> Anonymous
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>> Anonymous
>>297312
You should really take a picture with the lens cap on so you can make sure each bright dot is a hot-pixel. Try a few different exposure lengths/ISO combinations and see how many hot pixels you get. I am not sure if this is normal for the D90 for such a long exposure. I think there is a difference between 'hot pixels' (that show up at any shutter speed) and 'noisy pixels' (that start showing up in long exposures). If you are getting hot pixels at normal shutter speeds or the number of noisy pixels starts increasing for the same shutter speed/ISO over time (take a few test ones every few weeks and compare) you might want to try getting the body fixed / repaired under warranty.

http://registry.gimp.org/node/180
>> Anonymous
F22, over 6 minutes....

Most star trails are shot around f5.6-f8 and last around 40 minutes to an hour.

Lrn 2 star trail
>> Anonymous
>>297856
Learn to stack.
>> Anonymous
>>298009
unless you want gaps between your stars, you don't stack star trail shots.

you lrn2 stack
>> Anonymous
>>298079
because the lightning speed at which they blaze through the sky means you don't have a fraction of a second to press the shutter again.