JW from PA wrote:
Hi ncribble, I think we did business before. I am interested in the extender, however I would like to check with my local camera shop to make sure it would work with my Tamron 70-300 lenses. I am sure it will work with my Canon F4 24-105. Can you allow me a couple hours to check. Thanks, Joe W.
I have serious doubts that this extender will work with your 24-105 f:4 lens. The front element of the extender protrudes from the extender and will hit the rear element of the lens.