Sorry if this is a dumb question, but thus far I've only owned one digital camera, an Olympus C-720, and have been planning to get a Canon Digital Rebel. I was originally planning to get it (or the most comparable model) in a year or two, after I had more experience, but some problems with the Olympus are causing me to seriously consider upgrading now instead, and I was hoping for some input.
The Olympus has had some problems with what I believe to be dead pixels on the CCD. About a year ago, I noticed that long exposure pictures were speckled with brightly-colored squares (typically 2x2 pixels per square, often with one-pixel outlines). I sent it in for repairs, and they replaced the CCD, and the problem seemed to be fixed. But now, less than a year later, I seem to be having the same problem, as well as one or two permanent tan squares even for short exposures. I have heard some mention of pixels on CCDs going bad over time, but I don't know if this is what is happening, or what the normal timeframe for this is. Also, assuming this is abnormal, could it be caused by my doing anything stupid (eg, taking pictures of the sun, dropping camera, etc?)? I'd like to understand the situation with my current camera before spending $1000 to replace it, although I am very much looking forward to having something more serious.
For a sample image, please seehttp://www-math.mit.edu/~osserman/sample/P6080160.JPG
The dots are clearest on the right side of the photo, towards the middle.
Thanks for any insight you can provide,