shooting this on a 5D mark II, the sharpness and microcontrast is amazing wide open. Much better in the corners than canon 16-35 (mark I or Mark II), as well as sigma 12-24. Flare is well controlled, and CA is nearly non existent. I bought a focus confirm chip off of ebay for 14 dollars, which allows focus confirmation, and includes exif info in the shot. The sole weakness of lens is hefty barrel distortion, and some mustache distortion, which is well corrected by ptlens, as well as a profile floating around for ACR. Just an unbelievable lens, at a bargain price. I would have happily paid 1000 for this lens.
I bought this lens for my Nikon D3000. The reviews were mixed because it does not have vibration reduction built into it. I have been using it for several months and find it to be an excellent lens. I recommend it highly.
I wasn't sure what to think of this before I received it, but I'm having a great time with this new lens. It's much lighter than I expected it to be, as I'd had a 200 mm telephoto many years ago. I really like the lens hood's capability to store on the lens in the reverse position. If you're looking for a zoom lens without spending much money, this is it. Overstock's service was great as well.
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