Gorgeous super sharp WA lens. Sharp corner to corner, at wide open aperture, at entire zoom range. The color is just pop. It is better than my AFS 17-35 (sharp only in the center, at wide open, need to stop down for sharper entire frame).
At 1st, I kind of reluctant to try it since I have 17-35 already. But after I tried it, holly smokes, I MUST to have it. It is has kind of quality that I cannot get from 17-35. The color and bokeh is just way more pleasing to my eyes. It makes D300 shows its capability in WA department.
NO filter ring is the only my draw back. I guess I have to make my own custom Lee filter holder myself. The IQ of this lens is very hard to resist. It is worth the price.
Flare is a problem, but it can be controlled easily with your technique. Most WA lenses have flare problem. I think this lens has the least.
I am not a WA guy, but after owning this lens I start to take panoramic photos.
For weddings, this lens is an absolutely must use lens.
If you need real High Quality WA lens, this IS THE LENS.
BTW, that bulbous almost protruding lens shape looks sexy, attracts quite a lot of interest at several parties. It is not fish eye lens, as many thought.