The Canon T3i worked perfectly all through the winter semester and on our vacation in July and August, and was working well in a video class up to about a month ago. Now it seems that after a while, there are two fixed blue spots on the video images, and also some video noise in darker scenes. For the video shoot in this class, they needed two cameras and rented an identical T3i from the AVC, and it worked properly. I tried it on video for maybe 10 minutes or so after it had been on and warmed up, and had no issues. But of course, for the class assignments, the camera is showing the blue spots, and the image is noisier from her camera than the school's T3i.
I'm thinking the sensor has dead pixels, or semi-dead that appear after the camera has been in use for a while. Since I can't yet duplicate the problem, I can't see which conditions are causing it.
I just wonder how much this will take to get it fixed, or if it's even worth fixing. It has worked perfectly up until November.
BTW, she also has a black & white photography course next semester. And this will be on film. So I had to do a crash course on film photography for her. I will let her use my old Minolta gear since it has no resale value to it, and I have a lot of lenses.