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"RE: Nikon 500mm f/4 AFS II on D600 with Nikon 1.4X II HELP"
Did you try using different AF sensors? The center sensor is the best, and the adjoining cross sensors are very good. Did you try AF-S single point and AF-C Dynamic 9 point? Did you try Live View AF - it uses a different technology?Did it make any difference if you were close to correct focus vs. far off? On my 600 f/4, sometimes the camera just gives up rather than hunting if focus is far off.Eric BowlesNikonians TeamMy GalleryWorkshopsNikonians membership — my most important photographic investment, after the camera