/p/ - Photography » Thread #297241

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Anonymous Thu 20 Nov 2008 13:51:00 No.297241 View View Reply Original Report

Whats Wrong with my camera? Why are there red, green and blue dots on my ~5min exposure?

11Equipment MakeNIKON CORPORATIONCamera ModelNIKON D90Camera SoftwareAdobe Photoshop CS2 WindowsMaximum Lens Aperturef/4.4Sensing MethodOne-Chip Color AreaColor Filter Array Pattern970Focal Length (35mm Equiv)52 mm111Image 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 RangeUnknown1

Anonymous

Anonymous Thu 20 Nov 2008 14:07:00 No.297244 Report

Quoted By:

http://letmegooglethatforyou.com/?q=dead+pixels

Anonymous

Anonymous Thu 20 Nov 2008 14:25:00 No.297247 Report

Quoted By:

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

View Same Google ImgOps iqdb SauceNAO unknown.jpg, 0B, 0x0

Anonymous Thu 20 Nov 2008 14:35:00 No.297249 Report

Quoted By:

anonymous

anonymous Thu 20 Nov 2008 14:40:00 No.297253 Report

Quoted By:

Noisy pixels. It's not broken, it's just shitty.

Anonymous

Anonymous Thu 20 Nov 2008 14:47:00 No.297256 Report

Quoted By:

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

Anonymous Thu 20 Nov 2008 14:48:00 No.297257 Report

Quoted By:

On a D90? Ouch.
My D80 has lots, but it's almost two years old.

Pro photographer

Pro photographer Thu 20 Nov 2008 16:01:00 No.297296 Report

Quoted By:

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

Anonymous Thu 20 Nov 2008 16:06:00 No.297299 Report

Quoted By:

>>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

Anonymous Thu 20 Nov 2008 16:42:00 No.297311 Report

Quoted By:

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

Anonymous Thu 20 Nov 2008 16:44:00 No.297312 Report

Quoted By: >>297789

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

Anonymous Thu 20 Nov 2008 17:37:00 No.297319 Report

Quoted By:

>>297241
you're a fucking nigger.

Anonymous

View Same Google ImgOps iqdb SauceNAO unknown.jpg, 0B, 0x0

Anonymous Thu 20 Nov 2008 19:08:00 No.297466 Report

Quoted By:

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Anonymous

View Same Google ImgOps iqdb SauceNAO unknown.jpg, 0B, 0x0

Anonymous Thu 20 Nov 2008 21:25:00 No.297588 Report

Quoted By:

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Anonymous

Anonymous Fri 21 Nov 2008 03:57:00 No.297789 Report

Quoted By:

>>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

Anonymous Fri 21 Nov 2008 06:55:00 No.297856 Report

Quoted By: >>298009

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

Anonymous Fri 21 Nov 2008 16:53:00 No.298009 Report

Quoted By: >>298079

>>297856
Learn to stack.

Anonymous

Anonymous Fri 21 Nov 2008 20:39:00 No.298079 Report

Quoted By: >>298081

>>298009
unless you want gaps between your stars, you don't stack star trail shots.

you lrn2 stack

Anonymous

Anonymous Fri 21 Nov 2008 20:51:00 No.298081 Report

Quoted By:

>>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.

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