Went out for a blast today again, to see if the problem was still as bad.... Wasn't impressed tbh, with blue skies and no busy backgrounds like trees or water with patterns, it focussed well, see below shot taken yesterday in Norfolk, i'd class that as acceptably sharp for a flight shot.
When I took it out today, I deliberatly went after birds where the background wasn't a solid blue sky, it was very very bright, best light so far this year.
The MkIII failed to stay locked on to any bird where the background was busy, at times it would lock on but keep focussing to the background unless I pumped the shutter, I've never had this problem with birds when its freezing cold..
I tried all manner of settings and changing custom fuctions which have always worked fine, but managed stuff similar to the below pic
As I say, it was working fine until I took it out shooting birds in bright sunshine where there was some heat, like in this shot, there was plenty of light and things locked on perfectly, perhaps a little soft but they were moving at about 60mph
Gonna ring Canon tommorow and arrange to have the submirror done, alone with a CD with some sample shots on, if it comes back unfixed or it still sucks after all the firmware/newfix i'll not know what to do, I won't be downgrading to a MkIIn, whilst the MkIIn is a hell of a camera its not exactly great having to go back 3 years in time just to get infocus shots, I have a lot of things planned for summer/autum, and can't be doing with a body starting to screw up..
Kind of ironic I guess, given my comments earlier in this thread....
