« on: February 23, 2015, 08:28:51 PM »
I really love the results from my 600mm mk2 together with my 5D mk3 BUT I find it very hard to focus with. Like yesterday for an example. The main target was about 30m away. I had the setting on "16m and further away" because there would be no objects closer than that. But when I try to focus on the trees in the background that was about 200m further away it had big issues to find focus even though I think that the background had some contrast. I needed to use manual focus first and then it did focus properly on that distance. When I then wanted to set the focus again on the subject 30m away from me I again needed to use manual focus first. I tried several solutions by using more or less autofocuspoints and change the settings in the camera but I feel that the lens or the camera is struggling more than I expected. I have no friends with a lens like mine so I have no one to ask or compare to. Maybe the camera and lens is no better than so and that is what to expect but I find that hard to believe. Trying to catch flying birds is also really hard because I often need to focus manually first to somewhere close to the distance of the bird and then I can use autofocus. Can someone with own experience write about how it works for you? The examples are many when I have had a hard time getting the object in focus.
There is a setting in the 5DIII firmware to only use cross type AF points. That helped considerably.