Yes I had a similar but minor problem on my 550D too. Really frustrating. But it was fixed by Auto sensor cleaning so the easier the better. Thanks for the link
Note: It is VERY important to keep the camera still while it cleans itself. I didn't and faced the consequences once..
@shifu What was the consequence of not keeping the camera still when it cleans itself? Like Ariel's, mine cleans itself when I turn it off. (And on, for that matter!) It's a Nikon, though can't see that would make a huge difference!
Dead pixels are spots caused by a dysfunction of the LCD display or image sensor. In cameras, problem occurs when this happens due to the CCD not able to sense light correctly at all points most commonly due to dust; that is why Canon (and Nikon too, as you say) has provided with the 'Sensor Cleaning'.
When this occurs, you can see a 'spot' on all the affected images, which are not so pleasant. -_-
Sensor Cleaning works, in brief, by vibrating the Image Sensor to shake off dust specks, which are usually gathered in very dusty places or while changing lenses. So if there is something shaking off dust inside and you too give the camera (and the sensor, that is) a shaking yourself, there would be no effect on the gathered dust. And if it accumulates, you can get 'dead pixels' in your images which, you don't want. Ever.
So it saves your time as you won't need to clean it manually with a blower or so.
Thanks! (Actually, I knew what dead pixels were, at least in connection with monitors & guessed it was the same); it was more the need to keep it still at the same time.
I'll try to remember not to turn it off & put it away at the same time :)
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Note: It is VERY important to keep the camera still while it cleans itself. I didn't and faced the consequences once..
Dead pixels are spots caused by a dysfunction of the LCD display or image sensor. In cameras, problem occurs when this happens due to the CCD not able to sense light correctly at all points most commonly due to dust; that is why Canon (and Nikon too, as you say) has provided with the 'Sensor Cleaning'.
When this occurs, you can see a 'spot' on all the affected images, which are not so pleasant. -_-
Sensor Cleaning works, in brief, by vibrating the Image Sensor to shake off dust specks, which are usually gathered in very dusty places or while changing lenses. So if there is something shaking off dust inside and you too give the camera (and the sensor, that is) a shaking yourself, there would be no effect on the gathered dust. And if it accumulates, you can get 'dead pixels' in your images which, you don't want. Ever.
So it saves your time as you won't need to clean it manually with a blower or so.
I'll try to remember not to turn it off & put it away at the same time :)