« on: May 11, 2013, 09:02:19 PM »
Interesting. I just tried my 70-200 Mk II 2.8 with my YN622c output AF assist trigger and it's definitely faster too. Used to get focus lock confirmation in 1 to 1.5 second range in a totally dark room, now it's half a second or so.+1
My 24-70 Mk II 2.8 is a bit faster as well. Previously locked in the .5 to 1 second range (usually closer to the half second, now it's in the bit less than half a second range.
Both of them, in short, feel snappier - the 70-200 more than the 24-70 - when using the YN622c AF assist beam capability.
I jumped in the deep end the other day and did a shoot using my FW 1.2.1 5D3 with YN622c/YN568EX (plus two studio strobes), and it worked really, really well. My 24-70 (Mark I) 'seemed' to focus faster and more reliably. There was hardly an out-of-focus shot in the entire batch, and the shooting took place in very low light with a fast-wriggling subject.