uh oh, is this a dead pixel in my T2i?

[paulgandersman]

oh crap.

i was just testing out the T2i in horrendous lighting conditions to see how it fared, shooting at 6400 iso, only a small lamp on, etc. (looks like crap btw, to be expected) when I noticed what is possibly a dead pixel in my T2i! what do I do?? is this indeed a dead pixel? does this mean I have to get my whole camera body replaced? do I have to go through B&H (where I bought it?) go through canon? what kind of turnaround am I looking at? :/


the dead pixel is in the lower right at the very bottom.

 

[paulgandersman]

hmmm, strange i can't really see the dead pixel on ISO 400 and below... barely at 800. are dead pixels a common thing? should I keep this body and be grateful that the dead pixel is at the very bottom of frame and I can just punch in a hair? thoughts?

 

[shaocaholica]

Dead pixels are pretty common but most of them are filtered out for stills so even if you have them you usually don't see them. The in-camera jpeg processing gets rid of most of them and all RAW processors will filter them out too by reconstructing the pixel from its neighbors.

 

[paulgandersman]

but what about for video? what would you do in my situation?

 

[shaocaholica]

Median filter or some other mask on that area. But just on that one pixel or very small region.

 

[paulgandersman]

i mean i understand i can always take it out, or punch in or something, im just asking on advice for wether or not i should stick with this body, or swap it out for another one (which could be painstaking). and advice on if i DO swap it out, am I at high risk of getting another body with a dead pixel in a worse place, like center of screen!

 

[shaocaholica]

how hard would it be to get a new one for you? I would.

 

[paulgandersman]

well im not sure, guess i'll call B&H tomorrow. i just don't want to have to ship it back you know, then be without it for days and days and then wait for the new one to come in. sigh :/

 

[shaocaholica]

Don't do that. Just ask politely if they can cross ship. Ship out the replacement first and once you get it a verify its ok, send back the old one.

 

[paulgandersman]

oh wow, never thought of that. hopefully they'll be cool with it will find out tomorrow i guess!

 

[Babu]

oh crap.

the dead pixel is in the lower right at the very bottom.

Paul place the body cap on the camera. Go to M picture mode. Go to menu and look for sensor cleaning. Choose clean manually. Hit ok and wait 30 seconds. Then resume regular use. It will get rid of the dead pixel.

 

[paulgandersman]

Paul place the body cap on the camera. Go to M picture mode. Go to menu and look for sensor cleaning. Choose clean manually. Hit ok and wait 30 seconds. Then resume regular use. It will get rid of the dead pixel.

ok i can't event begin to understand how that worked but it did. what the hell???? how did that work?? and THANK YOU SO MUCH!

 

[Babu]

You are welcome.

 

[PaPa]

Just dust on the sensor. Looked too large to be a dead pixel.

 

[Martti Ekstrand]

http://www.dvxuser.com/V6/images/editor/menupop.gif

http://www.dvxuser.com/V6/images/editor/menupop.gif

what the hell???? how did that work??

It's something to do with micro changes in air density.




Or super-sonic vibrations of the sensor so the dust speck fell off.

 

[shaocaholica]

How is dust casting light? It was bright red?

 

[Babu]

Just dust on the sensor. Looked too large to be a dead pixel.

Nope. Dust on the sensor appears as darken gray spots/blotches on pictures and video from dslrs. It also only appears on really light colors/white doors/skies. He had a dead pixel on his camera which he fixed.

It's something to do with micro changes in air density.
Or super-sonic vibrations of the sensor so the dust speck fell off.

Nope. The camera did a remap of black to correct the pixels which are hot/dead.

 

[shaocaholica]

Nope. Dust on the sensor appears as darken gray spots/blotches on pictures and video from dslrs. It also only appears on really light colors/white doors/skies. He had a dead pixel on his camera which he fixed.
Nope. The camera did a remap of black to correct the pixels which are hot/dead.

So Canon's do this as part of the manual dust removal process?

 

[Babu]

So Canon's do this as part of the manual dust removal process?

The dust removal is done via the new sensor cleaning option that takes place when you shut down the camera. In older cameras you just use a dust blower to get the dust out. You can also do this for newer cameras if the dust is a lot. The dead pixel remapping is something I learned once the T1i came out last year as I had 4 dead pixels and didn't want to go through the headache of shipping and dealing with Canon for a $800 camera. It's nice to know about this technique especially as pixels can run hot as a result of shooting at High ISO speeds for a long period of time.

 

[tears2040]

The dust removal is done via the new sensor cleaning option that takes place when you shut down the camera. In older cameras you just use a dust blower to get the dust out. You can also do this for newer cameras if the dust is a lot. The dead pixel remapping is something I learned once the T1i came out last year as I had 4 dead pixels and didn't want to go through the headache of shipping and dealing with Canon for a $800 camera. It's nice to know about this technique especially as pixels can run hot as a result of shooting at High ISO speeds for a long period of time.

Excellent post, thanks !