Dead Pixels

[Ron Wilson]

What is acceptable from a new Digital Rebel XT? I got 3 dead at 1sec and 16 dead at 5 sec.

[Zeke]

All I see are frogs.

[foxbat]

Resizing from 100% is going to merge the dead pixel's colour with that of its neighbours. If you post 100% crops then we'll see them.

Strange that they are dependent on exposure. Dead pixels don't get killed by exposure as they are, by definition, already dead. Are you sure you're not just seeing image noise?

[buze]

"dead" doesn't necessarily mean "dead". Some of them just start to degrade output with longer exposure.
On my 350D a 10s exposure with the cap shows one white pixel. a 20s exposure will show 3, a 30s exposure shows about 5 to 10, with various degrees of visibility.

the "dead" ones are the one that shows in everyday photo under all circumstances (I have one of these, at least) the other ones are "potentials" and show in night photo exposures.

[Mitcon]

I hear so many people have problems with Dead/hot pixels everywhere I look, same with dust and AF focus. If you have an extreme amount of them that showup in your photos, then I'd send it back to have them mapped out. If you can't notice them under normal shooting use/viewing why worry. I think you will find that pixel problems are something most people will have to learn to live with shooting digital.

Given time even if you have none to start with they will appear over time. If I get one or two that I can notice when looking at a photo (not a long exposure with a lens cap on) I just clone them out. If I got tons showing up in normal use I'd have Canon fix it then. When I first got my Camera and after reading so much stuff on the net about hot pixels and back/front focus problems I tested my camera too. I found that I did have a couple of bad pixels, and the camera had very slight back focus.

But for the life of me I can't see any impact on my photos under normal viewing so I thought, why worry. I think if you look hard enough for a problem with almost anything, you will find one. In the end all I can say, if it bothers you, get it fixed as your the one who has to use it and be happy with the outcome. If your happy, don't worry and go enjoy shooting some more :)

[buze]

Having a few dead pixels is one thing, but there is a limit to it. Like on large LCD screens.

And long exposure without the lens cap on are important for some people. I'm really into night photography, and these pixels jump at you immediately in these photos.

Peeping how many you have is entirely legitimate. You blow a load of money on this kit, at least you need to know if you bought the bottom of the barrel, or the top.