Have Nikon D70 and need a teleconverter for my Nikon 300mm f4 AF ED (not S model) prime lens. Searched Nikon web site and other sources without luck, so tried Kenko Pro 300 x1.4 at local Toronto store and it worked for metering and AF. A Sigma converter provided metering, but not AF. Will purchase Kenko if no member can direct me to a compatible Nikon converter
I'm afraid teleconverters is a weakness of the Nikon line up. The AFS teleconverters will not mount on your lens. The recommended Nikon one is the TC-14B which does not give AF and I think it does not even give metering. The feedback I've seen is that the Kenko matches the TC-14B in terms of quality on an APS body due presumably to cropping of the corners. Also the D70 has a modest resolution anyway.
As an aside, an AFS teleconverter will mount on your lens if you remove the small tab from the TC. But you will not get AF.
A good site for Nikon info is www.NikonLinks.com