It's durable, easy to use and takes a fantastic shot at f/1.7. Does he have trouble concentrating on the outside of the frame? Of course it's not perfect, but other than that the frame is almost perfect. I bought it because I want to shoot at f1.7 so the focus issues I had on the outside of the frame don't bother me at all and I'm not a pro. I'm just a guy who loves to photograph stars, my kids and landscapes. It was way more than I expected for the price!
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