Review : http://www.amazon.com/exec/obidos/ASIN/B000V5P94Q/tipfla-20
This is the sort of lens that you buy if you know that you want to buy this sort of lens. If you're casually thinking of buying glass, this probably isn't for you. It's the best wide prime for Canon if you're looking for something that can autofocus. The difference between the 14mm of this lens and 16mm of the 16-35 is huge. The results are impressively sharp, and then lens is far more compact than the zooms which provide your only other options. If you want a wide lens on full frame and aren't concerned about your budget, this is your choice.
I have no idea why there's only a 6-blade aperture in this thing. I think they could have done much better. It doesn't usually matter, but it makes bright point sources look ... interesting. Not necessarily bad, but interesting. The effect on bokeh is negligible, since you're not going to get much bokeh.
Minor quibbles come from the front element, which of course doesn't accept filters, though there's a gel holder in the back. Next up, the hood (permanent, can't be moved/detached) is mostly useless; stopping flare often requires hands strategically placed to block the incoming sunlight. Finally, the lens cap only barely locks onto the hood, and comes off easily when removing the lens from the bag. I don't know why they couldn't design a lens cap that's secure -- some notches in the hood into which some clips actually engage would be a huge improvement.
Build quality is up there with the best black L lenses. Handling and use is good. The issues the lens has don't really make it any less exceptional, it's a lens you're going to love despite its minor flaws.
I can't see a good argument for getting this lens if you're on a crop body; you're paying for full frame corners in this sort of glass, and it doesn't make an exceptionally interesting focal length on anything short of full frame. It might be worth considering on APS-H.
More Detail : http://camera.babybi.com/detail.php?id_detail=19
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