Jorn, The Kenko Teleplus PRO 300 DG/DGX 1.4x AF Teleconverter will work with Nikkor AF-S and non AF-S lenses. I have used the "DG" version with the Nikkor 80-200 f/2.8 AF lens with no issues. The "DG" has been replaced by the "DGX" version.
Hope this helps...JL
________________________________________ 45+ years of Nikon ownership and counting Visit my SmugMug gallery
The current Nikon 1.4x, 1.7x, and 2.0x teleconverters all work fine with the 70-200mm VR-I. None are compatible with the older 300mm f/4 AF.
The Kenko 1.4x and 2.0x DGX teleconverters are compatible with both lenses, as are the slightly older DG models. Unlike the older Nikon TC's, they contain electrical connections to allow autofocus and all metering modes, although autofocus is likely to be somewhat spotty with the 300mm f/4 and a 2.0x TC.
The general consensus is that the Nikon teleconverters offer slightly better optical performance. I've been satisfied with my Kenko 1.4x DG combined with a non-AFS 300mm f/4, a 180mm f/2.8, a 1-ring 80-200mm f/2.8 and most recently a 70-200mm f/2.8 VR-II.
"There is no real magic in photography, just the sloppy intersection of physics and art." — Kirk Tuck