100% crop demonstrating the AF capabliity of the 300 F/4, TC20E-II and Nikon D70. I shot a half dozen or more with similar quality so this is about as can be expected of the "better" shots. In a number of cases the AF totally blew it. Or more likely, I did.

In camera sharpening Normal, no USM, saved as "Good Balance" JPG in Nikon Capture from a NEF file.

1/1250s f/11 ISO 400 EV -1.3, subsequently exposure was raised +0.89 EV in NC.