Excerpt: Received my Sigma and was excited to do some senior pics. I chose it over the Canon due to much research about clarity and bokeh. I own, or have owned many L series Canon gear and thought this would stack up to them. One minute after I opened the package and put the lens on I knew I had a bad copy. I thought to myself " I thought I bought a lens, not a machine gun". The Sigma would not autfocus ..
Pros: Easily Interchangeable, Nice Bokeh, Sharp, Strong Construction
Excerpt: Lens was returned due to erratic focusing issues. I spent 3 days testing the lens using Lens Align and with real world subjects. The lens showed a +3 backwards adjustment. I made the MA and shot as if I were shooting a client. At 5-6 feet... no issues under studio lighting. I would move back and shoot... the lens would miss. Not at F/1.4.... at F/5.6 it would show front focusing. Make more adjustments... it could not produce repeatable results.
Excerpt: After a couple weeks of waiting to get this particular lens, just in time for a wedding...I receive a faulty lens.<br /><br />It never achieves AF. It just stutters back and forth and never locks on to the subject. Manual works and the optics are as great as what I expected. It's just plain upsetting that Sigma can't get their QC right. "What is it with Sigma?"<br /><br />I currently have a Sigma 30mm which required MFA since it was back focusing.
Leider erst nach Upgrade für Sony A77 kompartibel!
Detlef Seeger-Kößmeier, Amazon
13 October 2012
Summary: Mit viel Freude habe ich auf das Sigma gewartet. Die Erwartungen waren laut aller Rezensionen und Testberichte groß. Leider ging die erste Sendung bei DHL Express verloren. Dafür um so mehr Freude als die kostenfreie sofortige Ersatzlieferung von Amazon eintraf. Angesetzt an die A77 und Auslöser gedrückt...Nichts tat sich......von Hand den Focus eingestellt und wieder umgeschaltet, nochmal versucht....plötzlich sprang der AF hin und her, pumpte, blieb stehen....unscharf.