Dead pixel on my 50D?

Recty

Recty

New member
I did a 15 second exposure tonight in my living room where I had my wife stand in one spot, in the dark, then I shined a flashlight on her, had her move, did it again... so in the end there were 3 seperate "hers" in the picture.

I was looking at it and noticed near the top of the picture and about centered there is one bright red spot. It's in all the pictures, not just one.

deadpixel.jpg


Is that a dead pixel? I bought the thing less than a month ago so I'm sure I can still return and swap it for a different one with Amazon if I need to.
 
That's actually what is called a "hot pixel" vs a dead one. You should try to return it if possible.
 
No kidding, but I'm glad I found it.

Amazon is replacing it for me, I should get the new camera sometime this coming week.

So, is there some sort of test I should do on the new camera to make sure all pixels function as designed to do?
 
Does ISO or anything else matter? Or just do 30 seconds?

And then to test for dead pixels do you do it at a white sheet?
 
Well it worked, this is a 30 second exposure at F/20 with ISO 100 with the lens cap on.

This is a 150x150 pixel wide picture, expanded 300%.

hotpixel2.jpg
 
Have you tried putting the camera in manual cleaning mode to remap the bad pixels on the sensor? Supposedly this works on the 5D and hopefully on the 50D as well.

- Put a cap on your lens or on your cam. body

- From the 'Menu/Sensor Cleaning' choose 'Clean Manually'

-Activate 'Clean Manually' and wait a bit (at this point the myth varies from not waiting at all to waiting 5 min. ; )) then turn the camera off.
 
Remaps the bad pixels? I find that hard to believe.

I'm at work, but in an hour or so I'll give it a shot.
 
Well I knew Canon could remap bad pixels if you send it into the shop...but I didn't think the camera could just do it. Especially with that method, since the camera isn't taking a picture, but just sitting there with the mirror flipped up.

Basically they are going to send you a new 50D, calibrate the pixels on the one you have, and sell it as refurbished. I have about 20 bad pixels on my 40D. It happens to every digital camera, kind of like age spots. Oh well what can you do, I don't blame you for a bit for expecting to have all the pixels in tip top shape on a brand new camera though.
 
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Well, look it up online if you don't believe me. You'll see many people have successfully remapped (removed) hot pixels by following what i said above.
 
I'm trying it right now. I have my camera sitting with the cap on in manual cleaning mode...just sitting there. That is all I have to do right?
 
<a href=showthread.php?s=&postid=14045308#post14045308 target=_blank>Originally posted</a> by TitusvileSurfer
I'm trying it right now. I have my camera sitting with the cap on in manual cleaning mode...just sitting there. That is all I have to do right?
Click to expand...

Yep, supposedly that's all you gotta do. 5 minutes should be enough. Hopefully you took a "before" picture to see if there was any difference. :)
 
Yep, and its been a lot longer than 5 minutes so lets see...I can deal with most of them, but there is this bright blue one that is rather large I would love to see go. Its near the center of the frame.
 
Nope, no difference. Even the little baby ones are still there. I suppose it is importiant to note that I only have bad pixels in long exposures. I haven't tested very many shutter speeds, but at 1/4 of a second I don't see anything wrong. At 30 seconds I have about 30 usual suspects.
 
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