The autofocus of this lens works quickly and take in 95% of cases, the object to be sighted.
Before that I used the 75-300 Canon .. Here you can tell definitely the enormous price difference!
After I tested the 100-400L some time, I simply times it made whim my old Tele. My first impression: Is it broken?
You get used to very quickly to the sharpness of the 100-400. Still, I'll be thrilled with security for some time this lens!
Thanks to the purchase me impossible motives and recordings have so far been possible ... Very clear 5 * and a buy recommendation!