Canon Digital Eos Rebel 300d
My Canon EOS 300D Digital Rebel is a significant overexposure to sunlight. What's wrong?

You do not have the kit lens, but Sigma AF 28-300. Worked without problems until about a month ago, when it began to fail 99. I searched Google and reported a body / problems compatibility of the lens. One solution proposed was to clean contact lens, which I did. But now seriously overexposure to the sun in several ways. I have no Canon reliable service where I live, so I'm a bit desperate to find out what could be wrong, and what I could do. Thanks for distribution.

Check your settings. Are you the Manual Program, Shutter Priority, Aperture Priority … if you set the agenda (if not there already) you will probably find this fix. If not …. what white balance is set to? What ISO? In direct sunlight probably want to be around ISO 200 or 400 … if you're around 1000 or higher this could cause the camera to display on your images. I think I've seen the same mistake at some point and I mean that was somehow caused by "Unlock" the objective of the assembly so that the contacts were not playing well. third party lenses like Sigma, Tamron, etc have to reverse engineer their lens to try to get to work with Canon and Nikon lenses and do not always work the way they are supposed to, but usually. Good luck!