Quote:
Originally Posted by M_Six
Just remember that a 100-400 with a Canon 2x TC will not give you AF on the 6D. The Kenko 2x TC will allow AF at f4 (which will be f8), but not reliably above that.
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True, good point. I honestly was thinking I'd be manual focusing anyway.
At the last races, I was manually pre-focusing on the warm-up lap and would proper shoot on the next lap. If I wanted to adjust my spot, I'd use empty track or the stragglers in the race to pre-focus on the new spot.
Although the last race of the day, I shot with the 6D and 24-105 from a closer spot - and because the XTi battery ran out and I forgot my spare - and it was nice to be able to use AF
Anyway my 70-300 IS USM lens is so slow autofocusing when fully zoomed in at 300mm, even without the TC, that I am faster with manual focus!