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Message posted at 05/16/2012, 05:31:50 AM by Suenos6 |
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Hi all.
On some of my images, at 100% I have noticed what I can only describe as burnt out, bright white pixels. I've noticed these on at least 2 shots taken in totally different circumstances. They appear in different places so are not, I believe "hot pixels", which I think are red and always appear in the same place.
Both shots were taken at relatively high ISO's albeit one was at about 4000 ISO, the other at about 1000.
does anybody have an explanation for this? They can of course be easily photoshopped out but I need to know if there is a problem with my camera or just something I need to live with.
FYI - my camera is a Canon 5D Mark 3.
Thanks |
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Canon EOS 5D Mark III,
Fuji X100
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Uploaded files:408 | Total Sales: 488
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Message posted at 05/16/2012, 14:08:44 PM by Suenos6 |
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Since posting this I've done some more research and discovered that it is in fact a purple spot which appears in the same place on all my shots.
A quick internet search and apparently this is known as a "hot pixel" and is quite common. Somebody suggested I set camera to "manual clean" and, once set, just turn camera off and on again and it then "remaps" the sensor.
To my great surprise this actually appears to have worked so thought I'd share this here just in case anybody else is experiencing this.
Sorry to everyone if this is common knowledge but I had certainly never come across this before.
Regards
Simon |
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Canon EOS 5D Mark III,
Fuji X100
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Uploaded files:408 | Total Sales: 488
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Message posted at 05/16/2012, 16:37:10 PM by Igordabari |
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The most probably these are just hot pixels given that ISO was extremely high - just out of reasonable range. Purple spot may appear at locations where matrix is heaten by electronics. Try to decrease IS down to 200 as a maximum. ISO1000 and ISO4000 are of no use for stock photograpy.
Hope it helps. Best of luck! |
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Camera Canon 350d with some set of lenses, CS5
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Uploaded files:808 | Total Sales: 1464
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Message posted at 05/17/2012, 05:04:37 AM by Suenos6 |
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Hi Igordabari.
Really appreciate the tip. I always do try and shoot at the lowest possible ISO but one major advantage with the 5D Mark 3 is its ability to shoot low noise shots at high ISO.
I'm lucky enough to have been using this camera since March and I'm finding that I'm able to shoot at up to 5000 ISO and get shots accepted as stock. As you can imagine this has opened up a whole new world of photographic possibilities.
Yes, I'm certain this was a "hot pixel" problem which by "re-mapping" the sensor, has now dissappeared.
Thanks again
Simon |
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Canon EOS 5D Mark III,
Fuji X100
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Uploaded files:408 | Total Sales: 488
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