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FORUMS Cameras, Lenses & Accessories Canon Digital Cameras 
Thread started 08 May 2010 (Saturday) 15:37
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help with mystery red dots

 
mattymx
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May 08, 2010 15:37 |  #1

Last night, I was trying out some timed exposures with my 7D and new tripod. Upon loading the images from the camera, I found that every image I took last night every one of them has 3 red dots in the exact same spot. I did a little ring around the dots. There is 1 red dot on the upper left and 2 inside the right circle.

This was shot with my 7D, 17-40L using ISO 200, F16 at 30sec. Thanks for your help. I will also email the JPEG to you if you need to see the image in its original state.


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Jim_T
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May 08, 2010 16:15 |  #2

Those are 'hot' or 'stuck' pixels. Not all cameras display therm, but they aren't that uncommon.. They usually show up on longer exposures where the background is black.. (Use the search function and enter 'hot pixles' in the search box. You'll see quite a few people have complained about them.

I had a 10D that had one stuck blue pixel from the day I brought it home from the camera store.

They can be mapped out using the appropriate firmware tools, but unfortunately Canon service centers are the only places that it can be done. If you want to get rid of them, you'll have to send the camera in for repair or get a replacement.

(Edit.. After I sent my reply, I took a 60 second bulb exposure using my 7D . I had the lens cap on so the image would be totally black.. I don't see any stuck pixels).




  
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mattymx
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May 08, 2010 16:43 |  #3

Thanks Jim. I did a search but didnt know the "hot pixel" nomenclature.


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help with mystery red dots
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