Excerpt: I have used it several times shooting sports.Just have to remind myself that it effects DOF.So if things seem out of focus this is why.Downloaded a DOF calculator to remind myself of this factor dofmaster.com Does slow auto focus at maximum distance but if you back off a little its fine.
Pros: Compact, Durable, Easy to Use, Great Picture Quality
Excerpt: I have rented big telephoto lenses before when I wanted to photograph wildlife in the distance. I always found them to be more trouble than they were worth. I admit that I am not the type of wildlife photographer who hides out in a blind or is happy to stand around in a crowd of photographer with...
Pros: Consistent Output, Easily Interchangeable, Lightweight, Strong Construction
Excerpt: I was specifically looking to enhance the zoom on my Canon EF 100-400mm f/4.5-5.6L IS USM lens which I use on a Canon t4i. Tried out several other teleconverters in the store, including the Canon at 4 times the price. This was the only one that retained the ability to auto-focus at full zoom.