Sat 08-Sep-12 04:49 PM | edited Sat 08-Sep-12 04:54 PM by Benkoop
> The TC20E III I consider superior to my TC17E. >
I'm curious in what way you find it superior Jim. I use the TC17E a lot with my 70-200 2.8 and I am pleased with the results, but I could use a little more reach - and wonder if it is worth the money to purchase the TC20E III. I would regret loosing more sharpness and quality.