extention tubes on ai-s lens
The Kenkos work, as they have the contacts. Although they AF, I am not sure about AF-S.
Here is a link to their site:
I use the PN-11 with my MF 105mm f/4 Micro-Nikkor(it has a tripod mount), and also with my Nikkor AF 300mm f/4, though in manual mode.
I am going to be converting my PN-11 to use the contacts from a Kenko tube. I have the tools and knowledge to do this, but I just need to find the time, and with my split-image focus screens, it really isn't a pressing need.
I found out how here:
'The brave ones were shooting the enemy. The crazy ones were shooting film.' - Norman Hatch USMC WWII Combat Photographer