Hot pixel?

sureshot

sureshot

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Just seen a mention of Hot pixels ,could somebody explain this ?
 
Basically where a pixel on the sensor doesn't record data and shows as bright white. Most camera will have a couple at some point. Easily fixed in photoshop and some cameras even map them out automaticly after a while.
 
if you cant see it - don't worry about it

if you can see a random white dot in the same place in every shot then thats probably what it is

if you really must check - take some shots of a fairly dark subject and look for white spots where they don't belong
 
sureshot said:
Thanks just seen somebody had 2000 on a new camera?
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Hmm.. Not sure I believe that.
 
yeah - even on one of the new 18MP cameras 2000 hot pixels would mean that 1/9 of the sensor wasnt working - it would be hard for that to escape the notice of quality control.
 
even on a 21 MP sensor that would mean that just under 10% of the sensor wasnt working - and that number of duff pixels isnt a 'hot pixel' issue - its a seriously shagged sensor that needs to go back to canon under waranty... assuming of course that the reviewer wasnt talking out of his fundamental orifice
 
sureshot said:
It was a review on a 5dmk11 I did a search .
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I still don't believe it, but if it were the case, it's extremely rare and would almost certainly be a warranty issue. I would not accept a camera with that level, it would be unusable.

I think you are worrying too much, it's really not an issue to have or two.
 
He did have a replacement and was very happy as I`m thinking of getting one just did to know how to check.
 
Flashman said:
Just under 0.01% surely? (2000 is a ten thousandth of 20 million)... or is my maths rubbish? :thinking:
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yeah - duh sorry :bonk: - I had a brain fart and for some reason was thinking one MP was a thousand pixels rather than the million it is.

however the fact remains that 2000 hot pixels equals a knacked sensor
 
big soft moose said:
yeah - duh sorry :bonk: - I had a brain fart and for some reason was thinking one MP was a thousand pixels rather than the million it is.

however the fact remains that 2000 hot pixels equals a knacked sensor
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hehe... yeah, my brain does that a lot too! :D
 
sureshot said:
He did have a replacement and was very happy as I`m thinking of getting one just did to know how to check.
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If its that bad you'll know about it after the first shot.
 
When TFT screens first came out the industry standard for a fail was 4 hot or dead pixels on a standard 1024 x 768 screen (786,432 pixels). An 18Mp sensor is 22.88 times as dense and if the same ratio still applies then around 90 hot pixels would mean a failure. 2000 hot pixels would be a catastophic failure, that's if my maths is correct at this time of the day, and you would have to hope QC would pick that up.
 
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