Excerpt: 24 and 28mm are focal lengths that are right in my wheelhouse, so I wanted a faster lens than the Nikon 24 f2.8 "D" lens but nothing as expensive or heavy as the f1.4. So this Sigma, reasonably priced at f1.8 was my best landing spot. It's a nice lens that does what it should - good lin low light, good for close focus, and for me a great focal length.
Pros: Consistent Output, Easily Interchangeable, Fast / accurate auto-focus
Excerpt: I have just received the lens and have experimented in low light indoors situation. Results were good. Waiting to see what it can do at night with lomg exposure times and large aperture setting.
Summary: 24mm is my favorite fixed focal length. Wide enough to get candid shots and great for street photography. Unfortunately this has been the softest lens (not sharp) out of any class of lens that I have used. It's going to be an immediate return. I am very disappointed in this lens. Sigma's new line of stuff (i.e., 18-35) is excellent high quality stuff. I have quit a few Sigma lens' and this one is by far the worse.
Excerpt: For the past few years I have been photographing inside an old, large, industrial foundry. It is a vast high place of pipes and ducts, and every surface is coated with layers of charcoal that sucks up light. High in the ceiling are fluorescent lights that glare but give little illumination. My subject is the furnace and the men running it, showers of sparks, explosions and glowing billets of brass that fly by on cranes.
Pros: Consistent Output, Durable, Easily Interchangeable, Easy To Us Manual Focus, Fast / accurate auto-focus, Rugged, Strong Construction
Excerpt: This is my first digital wide angle prime lens, and I couldn't be happier. It is fast, bright and has surprising bokeh. I use primarily Sigma full-frame lenses on my T4i. After a number of years away, photography is fun again!
Pros: Consistent Output, Easily Interchangeable, Fast / accurate auto-focus, Nice Bokeh, Strong Construction
Summary: This is the only "off" brand lens I own. I borrowed one a while back from a friend because I wanted a true wide angle macro. I did a very thorough test of this lens and it is as good as my better Nikons in macro mode. Not surprisingly the color is different but a grey balance and its good to go. I love this lens and the quality it provides as a macro.