The ir modified d200 I bought right here had de af calibrated to work with the 18-70mm 3,5-4,5G dx. It does work specially since I usually use it at f8ish.. Yesterday I was trying the big 300 in a gimbal and gave the combo a chance. To my surprise, the af was spot on even fully open at virtually any distance.
A few, fully open, minimal pp, from closest to farthest.