Upload & Sell: On
You can't put the current AFS converters on the old "screw-drive" type af lens without filing down a part of the mount. After the modification, the AFS converters will transfer the data, but the af will not work. The "standard" 1.4x for the old-style screw-drive 300 f2.8 is the TC-14b. This was a great combo in its day, but the newer AFS through VR designs are sharper.