Have owned this lens now for over one year and I am pleased with it. Although heavy (any lens which goes to 600mm is going to be heavy - its the laws of physics) it is lighter than the Sigma equivalent.
I have found the focusing to be fast and accurate (particularly in live view on my Canon 90D) - it hunts now and then but I hired a Canon 600 f4 for a few days and that also hunted now and then - trying to achieve focus on a small bird some distance away is a big challenge for any lens/ camera combination.
I usually have it on a tripod - I just find it too much hard work to hand hold so I can't really comment on the vibration control.
It returns pictures which are sharp enough for me (see my gallery here on bird forum) and overall strikes a good balance between affordability, portability, and picture quality.
I have found the focusing to be fast and accurate (particularly in live view on my Canon 90D) - it hunts now and then but I hired a Canon 600 f4 for a few days and that also hunted now and then - trying to achieve focus on a small bird some distance away is a big challenge for any lens/ camera combination.
I usually have it on a tripod - I just find it too much hard work to hand hold so I can't really comment on the vibration control.
It returns pictures which are sharp enough for me (see my gallery here on bird forum) and overall strikes a good balance between affordability, portability, and picture quality.


