Summary: This is my first step into prime lenses and I'm impressed. Very sharp image quality. Great bokeh. Not as wide as I thought, but that's just from my inexperience with prime lenses. Great image quality and bang for your buck for sure! The rattling that you hear goes away once you turn on your camera, I wouldn't even worry about that for a second. I really like the ridged focus ring too.
Summary: I am really impressed with this inexpensive lens. For only $200, this lens is tough to beat. Sharp pictures, fantastic Bokeh. This lens mounted on my Nex 6 makes a wonderful family outing lens. Most of my family pictures are environmental portraits. This lens, wide open at F2.8 produces sharp photos of the the subject with just right amount of blurred background to let you know where you took the photo but makes the viewer focus on the subject.
Summary: You can get some very sharp photos with this lens, even wide open. Its small size and light weight make it an excellent prime lens for my Sony Nex cameras, and its 2.8 maximum aperture, though not super-fast, is plenty fast enough for most situations. A faster aperture would mean a bigger, bulkier lens, and I'm happy with this tradeoff.
Summary: I finally got a chance to use this lens many months after I had purchased it. I took it out on a cloudy & snowy day a couple of weeks ago in a park near by to take some winter pics and I must say that the low light performance of this lens was great. also every time I blew up a picture I was amazed at the detail reproduction. the other great thing I like so much about this lens was the price. great job Sigma.
Excerpt: This lens gets solid reviews but what caught my eye was the ability to remove the rear baffle which allows the lens to cover most of the full frame of the A7. This allows me to have an autofocus lens for stills and video to compliment my Contax G lenses and a Voigtlander 21mm. It is sharp top to bottom and and to the sides until it vignets near the edge and is cropped to around say the 35mm focal length. Video is better with this than the 10mp apsc crop mode.
Summary: This is one of the sharpest lenses I've ever used! Beats out almost all my Nikon lenses wide open, some of which cost 5x more! AF speed is just OK, since it doesn't support the phase detection autofocus of the NEX-6 and 5R, but definitely not sluggish. Manual focus ring is buttery smooth and very responsive. Lens hood reverses for extra compactness.
Excerpt: This lense fits and looks really nice on my Sony NEX 5R. Build quality is excellent. The size profile is comparable to that of my 16-50mm OEM kit lense which makes it a nice size for packing into my small camera case or walking around. This lense provides really nice sharp and contrasty photos. Overall image quality seems a little better than what my OEM kit lense produces, right down to F2.8. Auto focus is quick and accurate.