Recently bought Cannon 5D with 24-105 IS lens, and found that vignetting are noticeable in 24mm FL, this become more obvious when i attached CPL filter. (See attached sample). Back to Canon Reps. in my Country and Regional, and they all suggest me to use Focal length higher than 24, or using Fstop higher than 8 to avoid vignet. Anyone have any idea about my problem ? how come this Expensive Camera, has this silly problem ? I know this is the consequence of being Full frame, all the explanation and reasoning i already receive from Canon Office, Asia Pacific region. But Still, my simple question is remain un answered, how come Canon release such "defect" product ? No further response of my email regarding this from Canon. Im a freelance Oil company facility photographer, and surely I need wide angle photographs, but now my new Eos 5D are unuseable, vignetting from my point of view are not acceptable.