Excerpt: I may be able to give this lens more than one star if it wasn't so hyped up by professional reviews. I think I got a bad copy, but honestly mine was VERY soft at anything under f5.6. and the frame was inconsistent with a couple sharp areas and many many soft ones. It also seemed to have inconsistant focus on my 50D. It would focus at different levels on the same object, every time you pushed the autofocus. Needless to say I returned mine.
Excerpt: I bought this after reading the reviews but didn't note anything about the Auto Focus NOT working on a lot of the popular Nikon models like the new D5100. I tried the manual focus but it was soft on the dozen or so images that I took in the half hour before I put it back in the box and returned it to B&H. I have to add that dealing with B&H since 1984 has always been a pleasure and I will buy here again.
Excerpt: I wanted it to be good, I wanted so much that I took over 100 shots because I couldn't accept the truth. On my 7D, the 28-135 kit lens was way sharper. AF speed is good, AF noise is OK,build is good although I don't like the clutch. Also I found myself handling the focus ring instead of zooming, because it's reversed compared to Canon.But the biggest drawback was focus. Nowhere near sharp, both using Auto or Av settings.
Summary: Wir waren in der Versuchung die Optik an einer Blackmagic Camera zu verwenden. Leider ist die Abbildungsleistung der Optik mangelhaft. Jeder Flaschneboden liefert ein schärferes Bild. Absolut mangelhaft in der optischen Performance, gefasst in einem Plastikgehäuse. Leider nicht zu emfpehlen.
Summary: Die zahlreichen veröffentlichten Bilder und Kommentare zu diesem Objektiv haben mich dazu veranlasst, mir ebenfalls diese Linse zu bestellen. Leider waren die zwei Versuche umsonst, denn beide Exemplare stellten an meiner 600d einfach nicht scharf, zumindest nichts, was weiter als 2m (!!!!) entfernt war, weder mit AF noch mit manueller Fokussierung.