After looking through a bunch of pictures with blue sky I noticed a blob in the same spot on all my pics taken with 2 different lenses. I just took the lens off, lifted the mirror to look at the sensor. I don't see anything on the sensor(the sensor I take it is against the back of the camera when looking inside?). No dust or blobs of anything. I used my blower anyway in case there was something floating around in there. Any other ideas? There won't be any blue skies around here until next Monday to check and see if there is still something showing up. the 'blob'