zhangyue wrote:
I never realize AF can be this useful until I am after 135mm and slow lens like f4 with relatively poor designed Leica zoom's focus ring (compare their prime) that is not helping. I am sure I can improve myself on this. Just this is very new to me.
This is why I shoot my M system 50mm and wider with a Canon and a 70-200 as a second, complementary camera, at least for events involving a fair amount of movement/people. The concession is that it's not Leica or Zeiss glass, but IMO a lot of the latest Canon lenses aren't that far off. In addition to AF, image stabilization is a huge, huge benefit to quick, spontaneous shooting without having to think a lot about focus. Like you, I find it very, very difficult to eyeball focus 70/80mm on a current DSLR (I'm using the 1DX). At 50mm and wider, I don't find I quite miss IS as much and while this is an entirely different topic, find RF focusing to be fast and accurate enough. I'd thought about getting into ZE lenses, but knew I'd have problems manually focusing them on the fly.