Uh-Oh! I just noticed this dark blob showing up on my pictures. I've really cropped it tight and enhanced it, but it's there in the shots if you know where to look. I've had this 7D for 6 months now, and I've got a whole gaggle of lenses that I sometimes swap on and off a lot, so I'm not surprised. I'll have to try and give it a good cleaning before I go back to the airshow tomorrow. I'm just glad I caught it now before I've shot thousands of pictures this way. I've gotten 34,768 pictures with this camera since buying it right before Thanksgiving last year, and I've only scratched the surface on what it can do.