01-26-2014 08:39 AM
01-26-2014 10:04 AM
Just in a push / pull & having been VERY SLOW to adapt to that style of zoom here's an important thing to consider about the difference. My left hand is much farther out supporting that weight when I can slide the lens in & out from where the hood mounts making me more stable. With a twist zoom that hand is closer to the body.
01-26-2014 12:51 PM
The "push/pull" Canon 100-400mm is not right or wrong. It is just different. You may like it or not. But I would suggest you try it first. I find it an easy to use lens and I use it on nearly every wedding I photograph.
The EF 70-300mm f4-5.6 L is another candidate you might consider if you don't go for the push/pull.