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06-10-2014, 07:09 PM   #1
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Are these hot pixels?

I did some night shooting in bulb mode to try to capture lightning

Are these red and green dots hot pixels ?

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06-10-2014, 07:16 PM   #2
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The red dot in the center of the frame indeed looks like a hot pixel. I couldn't spot the green one though. It would help to see a 100% crop.

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06-10-2014, 07:19 PM   #3
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Definitely see the red one... I can't see a green one, either.
06-10-2014, 07:22 PM   #4
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QuoteOriginally posted by OnTheWeb Quote
Definitely see the red one... I can't see a green one, either.
Here's a link to the full image on flickr. Pentaxforums compresses things.

https://www.flickr.com/photos/piziak/14208744857/

06-10-2014, 07:26 PM   #5
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Maybe. The most telling thing is if you shift your camera a bit and take the same exposure - are they in the same place? If in the same place they are hot pixels.
If they move then they are something else.
06-10-2014, 07:26 PM   #6
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Oh yes, I see the green ones now... About 1/2 dozen or so up in the dark cloudy area and few more red ones.

I have an old Canon S2IS that has hot pixels like that.
06-10-2014, 07:28 PM   #7
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Update: I did a pixel mapping. Then I put the lens cap on and took a 30 second photo and it seems to have corrected things.

30 sec photo with lens cap on after pixel mapping: https://www.flickr.com/photos/piziak/14391868741/
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