bleirer wrote:
Very informative video, thanks! One question though, my mirrorless Canon says it will auto focus to f11, so in theory I could use a 2x with the 100-400 f4-5.6 almost to the max. In practice?
In practice, I sure wouldn't want to use that combo :) F/11 is pretty bad (for many of my subjects, ISO would be through the roof - and subject isolation would be non-existent), but I also think IQ would suffer with a 2X behind a zoom lens. However, without a full test I can't say for sure - just seems like a bad idea.