This is a duplicate post from my posting in rec.photo.digital (Just
covering all bases)

I'm having a heck of a time keeping focus on moving objects w/ my D200.

I'm using a 200-400 f/4 on it, and it's set to "Active" focusing, I've

tried all sorts of combinations on the D200.

I set it to Constant focusing (Of course),  I've tried the AF area mode

settings on group, dynamic...all of them, with various combinations
with metering selections.

When I'm doing wildlife or cars, I can't seem to keep the object in
focus as I pan without releasing & re-depressing the shutter release
for exposure reading.  I expect that once I compose the object, take a
meter reading & hod the shutter release down part-way, the lens/camera
should hold focus as I pan.

Any suggestions?

Thanks much!!