Excerpt: I've probably only shot about 100 images so far, but I'm not real happy. On a sunny day shooting runners they all had some sort of halo around them, not a good one. Like the colors were running together. Indoor soccer seems a little off too.
Pros: Durable, Easily Interchangeable, Strong Construction
Excerpt: Was very happy with this lens for 4 months until.... had the lens mounted on a Nikon body in my Domke bag. The bag was sitting on top of a 12" tall tool box and it fell forward. Set it back upright not thinking anything of it.
Excerpt: I bought this lens because the range and aperture were what I was looking for without the Canon L price. The lens was bigger than I thought but very easy to handle. Focusing was dead silent and I loved everything about the lens but it refused to take sharp photos, even on a tripod.
Pros: Rugged, Silent autofocus, Strong Construction
Excerpt: This lens does provide excellent output, extremely sharp, great contrast - in almost every way a great alternate to the Nikon 24-70 - when it's in focus. On the two I tried the HSM system will continuously hunt for focus, even on a brightly lit, strong contrast target.
Summary: Found this very unreliable on focus. Leaning forward it zoomed in by itself also which was annoying! I use a D7100 and when it was right, wow, sharp! But took some extra calibrating, but even then went on to miss focus on about 40% of shots. Not good enough so had to return it. Shame.
Summary: Nutze Canon 5D Mark II Bin mir nicht sicher wieso... aber extreme Vignette.. immer 1-2 mm vor dem Fokus scharf.. (kann man korrigieren bei manchen Kameras!) und der Fokus hat oft nicht funktioniert (kann jedoch auch an der Interaktion mit meiner Kamera liegen, da ich jetzt ein Canon 24-70 habe und...
Summary: Io sono sono mai stato un grande estimatore degli obiettivi della Sigma, però essendo curioso di natura e non volendo avere giudizi di parte senza averli neanche provati appena ho un amico oppure un collega che li ha, sono molto felice di avere la possibilità di provarli.