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Thread started 26 Nov 2004 (Friday) 20:10
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Hot pixel in my 20D, should I return it?

 
Toogy
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Nov 26, 2004 20:10 |  #1

I just got my 20D today and did some long exposures (8-13 seconds) and I have noticed a RED hot pixel in every one of my shots.

I know it can easily be cloned out, but should I just return it for another one?
What would you do?

Thanks



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FlipsidE
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Nov 26, 2004 20:36 |  #2

Hot pixels have been known to turn up at shutter speeds longer than 1/10. If it were me, I wouldn't worry about it. As long as you aren't seeing it a shutter speeds shorter than 1/10, I think you're good to go.

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Toogy
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Nov 26, 2004 20:39 |  #3

Upon further review I notice it on some ISO 800 shots I took at 1/50 second as well. Not as bad, but it's there.



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LouDawg
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Nov 26, 2004 20:40 |  #4

All of these digital cameras will have some hot pixels. There's nothing you can do about it. Chances are that if you returned it for another you might even get one with a worse problem. If it's a really big problem use the long-exposure noise reduction feature.


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FlipsidE
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Nov 26, 2004 20:58 |  #5

LouDawg wrote:
Chances are that if you returned it for another you might even get one with a worse problem.

SHEESH...I know that TOO well. Sometimes, I think it might be best not to take the chance.

Anyway, back to the main topic. Higher ISO will also make hot pixels show a lot more. I'm sorry I forgot to include that in my original post in this message. Either way, your camera sounds fine.

Edit: On a couple of my old DRebels, I had one or two hot/dead that showed up even at like 1/200 at ISO 100. I call that a problem. But, I think you are just fine.

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pcasciola
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Nov 26, 2004 21:10 |  #6

That's unusual for a 20D. I did some long exposure tests with mine and they were extremely clean.

Here are some tests I did a while back. Even with multi-minute exposures I had to look pretty hard to find the noise except in the extreme cases where I tried 2-5 minutes at ISO 1600.

https://photography-on-the.net …ad.php?t=46024&​highlight=

If it's that obvious in every shot you are taking, I might be inclined to return it. Can you post an example? Maybe a 100% crop of the affected area?


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Toogy
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Nov 26, 2004 21:21 |  #7

Ok here is what I am talking about
Full picture

IMAGE NOT FOUND
HTTP response: 500 | MIME changed to 'text/html'


In the frame of the fireplace in the background, is the hot pixel

100% crop
IMAGE NOT FOUND
HTTP response: 500 | MIME changed to 'text/html'


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tim
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Nov 26, 2004 21:28 |  #8

I'd probably talk to the place I bought it about exchanging it. When you buy a camera that expensive you expect it to work perfectly.


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Persian-Rice
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Nov 26, 2004 21:36 |  #9

Tim, when I buy any camera I woud expect it to work flawlessly. Hey, there is no harm in returning it............other then you ger a camera without the hot pixel.



  
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pcasciola
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Nov 26, 2004 21:50 |  #10

Persian-Rice is right. You paid $1500 for a camera, it should work perfectly. You shouldn't have to be bothered with cloning that out every time you take a 5+ second exposure. I'd definitely return it if I were you.


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wtfmate
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Nov 26, 2004 22:02 |  #11

My very first 20d that I picked up had a dead pixel, I went and returned it and got another one, then that one had a defect on the lens, so I had to go back and get a new lens, im on my second 20d, and my 3rd lens

This one is perfectly fine though :D




  
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drisley
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Nov 27, 2004 06:45 |  #12

... :arrow:


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drisley
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Nov 27, 2004 06:46 |  #13

Toogy, that is completey normal.
Only 1 hot pixel at extended exposures/high Iso's is actually very good, even for the 20D.


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leonid
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Nov 27, 2004 07:01 |  #14

All digital cameras have some hot pixels. You should evaluate the severity of the problem.
Try to find out the number of hot pixels and their luminance.
Here are test results for my Digital Rebel done at ISO 100 (Of course at ISO800 it would be much more of them):

- At 1" exposure I've got 1 hot pixel with a luminance 30 or greater.
- At 30" exposure I've got 24 hot pixels with a luminance 30 or greater. 6 pixels had luminance 60 or greater. With a "naked" eye I could see only thee dots on the screen. But each dot contains several pixels.

I used the program http://www.starzen.com​/imaging/deadpixeltest​.htm (external link).




  
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Toogy
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Nov 27, 2004 07:18 |  #15

Using that program at ISO200 for a 20 second exposure I got 7 hot pixels with a luminance over 60 and 17 over 30. When looking at the image I can only see that one red pixel, perhaps they are 7 there?

Acceptable?



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Hot pixel in my 20D, should I return it?
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