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Title: A great lens under good conditions, but don't expect perfection
Review: Hello,Got this just to try out fisheye lenses.During daylight quality is awesome very sharp.Focus is slow (and loud) compare to USM.Focuses all the way down to a few inches so you can get some insane perspectives.During the night, even with AF lamp assist and flash metering thing it focuses about *half* the time ... on 5Dm3, didn't expect that at all. Granted once you lock in focus it's an amazing perspective, 2.8 really helps with low light ... but kind of bad for focusing.Even at 15 mm you get some depth of field if you focus close enough, or focus misses ...Recommended, but don't expect perfectionCheers.
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