It is not lens flare or filter flare. It is light reflecting off the back edge of the mirror. It has affected 5D1 and 5D2 photographers. Here is an example:
http://forums.dpreview.com/forums/read.asp?forum=1032&message=30984031
It is not lens flare or filter flare. It is light reflecting off the back edge of the mirror. It has affected 5D1 and 5D2 photographers. Here is an example:
http://forums.dpreview.com/forums/read.asp?forum=1032&message=30984031