So I thought finding info on this would be easy but it has not.
I picked up a Tokina 300mm f/2.8 AFD lens and has a screw-type AF system. I have been looking for a 1.4x & 2x teleconverter for it but I have not been able to find any info which TCs have the screw drive in them as none of the newer one's do.
Kenko and Tamron have a 2x (pro versions) that have the screw drive, that I may just settle for which is fine but if there was another option I would like to learn about it.
Thanks for any help.