This lens seems to be built well and of good quality. I wanted it for shooting high school football. I have rented a Canon 70-200 L IS f2.8, but wanted to buy my own lens. I liked the idea of a 300mm with zoom feature. I read this lens has difficulty focusing in low light. I'm confirming that. I lost many shot due to subject being out of focus. Under fast moving sports in moderate light (nigh games with average lighting) this lens struggles. I have returned it and will buy the Canon I used in the past.
However, if you are not photographing sports in low light, then this is likely an excellent lens. I did not notice the "flaky" paint described in reviews, however I am extrememely careful with my gear.
This lens is heavy (nearly double the Canon) so the extra 100mm comes at a weight expense. However I was using a monopod so no big deal, but if you don't use a monopod this would be significant information to know.
I wished it would have worked better, had my hopes up. So this is likely a great lens for the money, so long as lighting is good.
I used the lens on a Canon 5D Mark II.
PS: I assume the focus was related to lighting, however I did not use the lens during the day, so I can't be certain. But I did have shots in focus so I attribute the out of focus to light conditions.
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