i am having difficulty focusing small birds on distance with busy bg. even with "focus search off" the 500+1.4tc works pretty slow at 10m-infinity switch on.. tried different CFNIII-8 but nothing helps.
can anyone tell me what to setup for BIF in 1DMk IV ?
i have 7d also and i find the zone feature good for tracking and it does lock up the in-flight.
1DMk IV focus is just spot on but i really find tracking is bit trouble.
plz guide.

