The AFS 300 f4 is killer bee with TC 14 but will not focus reliablly with 17 or 20? I know Nikon makes no promises, but I was surprized to find that even in bright light, it just wouldn't work. Both work fine with 70-200.
#2. "RE: AFS 300 f4 and TCs" | In response to Reply # 1dankeny Nikonian since 29th May 2006Thu 20-Sep-12 12:01 AM
I rather expected it to do just that. After mounting it, and it failing to AF, I cleaned all the contacts and tried again. Still, no AF. It tried, but couldn't acquire focus. I don't have that much experience with TCs, having avoided them In the past. Both the TC 17 and 20 focus fine on my 600 f4. Apperture is not the whole story.