Finally have decided to join the "fray" after reading the site for awhile..
Anyway - just purchased a new nikon 80-200 f/2.8D zoom for my D70s. Yesterday went to the local airport (CYMM) to try it out.
The autofocus went nuts when tracking inbound aircraft - would often take off to macro from infinity...if I kept the shutter pushed down it would come back.
I tried changing focus area from the local spot setting to dynamic area, but it didn't seem to help. It was cloudy in the background.
Anyone have any ideas on the problem?