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09-14-2011, 11:51 AM   #1
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K-5, what are these spots?

Hi

Recently, I was out taking pictures with long exposure, by night in the city. After, I've noticed some bright spots on the pictures (red and blue one below). Can anyone tell me what is causing them?
I've had a faulty K-5 replaced before (not because of this though), so I just want to be sure there isn't something wrong with this one. Could it be dirt on the lens?


This is just a crop of the real picture, just wanted to state the obvious

09-14-2011, 11:53 AM   #2
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Those are hot pixels, Unless this is a 100% crop, then they look awfully big! Try using pixel mapping to suppress them.

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09-14-2011, 12:14 PM   #3
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QuoteOriginally posted by Adam Quote
Those are hot pixels, Unless this is a 100% crop, then they look awfully big! Try using pixel mapping to suppress them.
You caught me there, it is a 100% crop.
This is the original picture:


What is pixel mapping, sounds familiar?
09-14-2011, 12:19 PM   #4
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I have a question....saw a couple of hot ones a while back, then they were gone. Can they disappear on their own? I have never run any pixel mapping. Never really been a problem, but I am curious?
Regards!

09-14-2011, 01:23 PM   #5
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Many (most?) programs handling raw files remove hot pixels auto-magically when opening the files. That is probably why most people never see them.
09-14-2011, 02:08 PM   #6
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QuoteOriginally posted by mikknu Quote
You caught me there, it is a 100% crop.
This is the original picture:


What is pixel mapping, sounds familiar?
Pixel mapping is a routine built into the camera (in the Setup Menu 4 at the top). It will find and mask them out or turn them off, not sure which. I had a couple on my K7 that I could actually see on the rear LCD. Mapped them out, never saw them again.

09-14-2011, 05:26 PM   #7
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All cameras have hot pixels.

Most RAW converters will map them out.

Long exposures are more prone to them then short exposures.

They can appear to come and go and I can't expain that one.
09-14-2011, 05:26 PM   #8
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Hot pixels or not, thats a real cool pic IMHO. Love the colors

09-14-2011, 10:33 PM   #9
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Thanks a bunch guys, great feedback. Now I know it's common, it wont bother me.

QuoteOriginally posted by cali92rs Quote
Hot pixels or not, thats a real cool pic IMHO. Love the colors
Thanks man, appreciate it
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