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FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
Thread started 14 May 2012 (Monday) 04:23
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5D MARK III Sensor Problem Heads Up

 
KCY
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May 16, 2012 04:53 |  #46

Lowner wrote in post #14439052 (external link)
Thats not really the issue. Yes, Canon do offer an in-camera method of mapping out hot and dead photosites, which only goes to show how common it is (its in all our cameras). But a real, long term answer has yet to emerge.

I don't think it will ever be possible, seeing how the technology of miniaturisation and accuracy has gone forward I expect that the future would be the same.

For example say a pixel was 1x1 mm square and they could make it with 70% accuracy (square with rough edges).

in a few years time they are able to make a 99% 1mmx1mm square however they don't do this, instead they now make a 0.5mmx0.5mm square at 70% accuracy.

So I expect once they can make a "perfect" 22MP sensor they would have moved on to higher densities with the same accuracy issues cropping up and therefore hot pixel issues as we see these days.


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May 16, 2012 05:39 |  #47

The real problem is with the current fundemental technology. You have a device with in excess of 23 million photo receptors, now I'm not sure how many components make up each photo site, but 3 or 4 would probably be a reasonable amount for a guess. Now you have a device with something like 75 to 100 MILLION components. A defect in any one component can lead to a stuck/hot/dead pixel. It is currently statistically impossible to make any device with that number of components without some defects. As reparing an integrated curcuit is not possible, finding a way to minimise the effect of thoee defects is all that is possible with current technology. Personally I think that we are very lucky to have the levels of quality that we do get.

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sambarino
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May 16, 2012 06:58 |  #48

Tired of dead/hot pixels? Try film. Oops, sorry digital forum. My bad.




  
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May 16, 2012 07:18 |  #49

sambarino wrote in post #14439429 (external link)
Tired of dead/hot pixels? Try film. Oops, sorry digital forum. My bad.

You just might be on to something! ;)




  
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JBF
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May 16, 2012 08:42 |  #50

I believe that Canon has a number of hot or dead pixels that is acceptable. I was told that it was .01% of the whole sensor. Thats a bunch of pixels. I think that works out to 220,000 Pixels Which is a small amount when thinking about the millions that are actually there. You can do all the shooting with the cap on and set it to bulb and do a 5 minute exposure and you will find probably many many more than you can see now. I am not sure if there will ever be a sensor that is free of these pixels, either hot or dead.


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May 16, 2012 11:03 |  #51

BigAl007 wrote in post #14439270 (external link)
The real problem is with the current fundamental technology. You have a device with in excess of 23 million photo receptors, now I'm not sure how many components make up each photo site, but 3 or 4 would probably be a reasonable amount for a guess. Now you have a device with something like 75 to 100 MILLION components. A defect in any one component can lead to a stuck/hot/dead pixel. It is currently statistically impossible to make any device with that number of components without some defects. As repairing an integrated circuit is not possible, finding a way to minimize the effect of those defects is all that is possible with current technology. Personally I think that we are very lucky to have the levels of quality that we do get.

Al

Good comments. I suggest that it will never be possible to eliminate the problems - at least until someone actually discovers perfection.

Paying a large amount of money does not guarantee perfection - it just comes a bit closer.

Glenn


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May 16, 2012 11:06 |  #52

Trying to obtain perfection in manufacturing or system uptime, etc usually becomes exponentially more costly the more 9s you want to have. There is a big difference in organizations' attempts and costs between 99.99% uptime vs 99.999%. I expect the same is true with sensor development and manufacturing. That cost only goes to one party, and that is the consumer.


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5D MARK III Sensor Problem Heads Up
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