Quote Originally Posted by creakingbones View Post
According to 'The New Nikon Compendium' published in 2004 by Lark Books, page 226 indicates that the Nikon TC14E II and the TC20E II fit and work with Nikkor AS-I and AF-S lenses. This means they will be compatible with the 24-70. There is a trade off though, with the 14E you will lose 1 stop and 2 stops with the 20E. Auto focus is retained with both. I use the 14E and it works a treat. Looks good too but costs a heap.
None of the Nikon TC's can work with the 24-70 f2.8 due to the rear lens element of the 24-70. As shown in the first photo above by Sar, the front element of the Nikon TC's protrudes forward and would foul on the rear element of the 24-70 as shown in the second photo by Sar, above. Not only that, but I've tried to and it doesn't work!