It is very, very hard to use as it doesn't focus to infinity. The working distance is something like 30 cm at 1:1 and 4 cm at 1:5. I would read up on it before buying, it isn't really for taking pics of anything alive.
I played around with one at the camera store for nearly an hour and focusing on a tripod with a focusing rail took 1 to 2 minutes per shot. That is with pro help as well. Very capable lens but for very specific uses.
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