Summary: I bought this lens for my Sony A7 using the LAEA-4 adaptor, since no sony product that covers this focal length. The pictures are sharp especially with aperture >F8. The lens is almost the weight of sony 70-200 f4 FE lens. Not weather resistant nor built with OS, but built like a tank. This lens is fun to use and you really have to practice with this lens. Great for landscape and interior photography. A wonderful addition for sony A7 series users.
Summary: This is my first Ultra wide lens and i m loving it.I chose this lens over Canon 16-35 mainly for those four extra mm at the wide end . I'm very satisfied with it . it's a great lens for outdoors use or in good light. Distortions are bad but are correctable. The lens is very well built but takes no filters. I have no other Sigma lenses to compare to, but it's not far at all from Canon's L lenses.
Summary: I have a Canon 8-15 fisheye zoom, but wanted a rectilinear in the 14mm range so I bought a Sigma 14mm.....lens was not sharp overall, so I sent it back. Then I bought a new Canon 14mm f/2.8L II.....it didn't get sharp even in the center til about f/8...it went back. Then I saw this lens and tried it....I loved it. While not perfect, It blew away both the Canon (which cost over twice as much) and the other Sigma.
Great lens for wide angle shooters who don't like fisheyes
19 April 2012
Summary: Very pleased with this lens. The images always need a little post work, but the extra width makes it worthwhile. (Update) - Love it (Another update - I still love it, just be careful the objects in the foreground.
Summary: Cons: Soft in corners at 12mm until f/11-16. A little more CA at 12mm than I had hoped with all that FLD glass. More barrel distortion at 12mm (but easy to correct) than I saw in tests of original version lens (I don't have it). Pros: Excellent landscape lens. Good corner sharpness when stopped down. Better than my beloved 17-40L Canon. (They have similar MTF charts). Good autofocus, fast and accurate.
Summary: Purchased this a little over a year ago. The only dissapointing thing was unlike the advertised picture this lens did NOT have the little auto/manual focus cut out switch (Nikon mount). I would love to have it on this lens but I have learned to work around that little shortfall. This lens is wonderful for capturing large vehicles up close (less than 15' away) such as Fire engines or trains. This lens enjoys lots of light.
Conclusion: Bought one used, mint. Astonishingly wide but this is a lens that begs to be used on a tripod and stopped well down, to f11 at least, if not further, where it does shine with some great results. It's just too slow for general hand-held use (which is not what it's really designed for). It's very well built and comes with the built-in hood and a nice case. It's a niche lens - landscapes and interiors - and for that it's really very good.
Pros: Very wide on full frame, sharp when stopped down, well built, quite inexpensive for the widest non-fisheye available, decent contrast. Remarkably distortion free if kept upright
Cons: Very slow at f4.5-f5.6, dreadfully soft at wider apertures, some CA, needs a tripod and liveview to get the best out of it - needs using like a large format lens really
Summary: I got amazed of how wide the lens is. Today I took some shots in a place im used to. First, I compared to the 24-70 mm L series from canon. Now the results: 1. Super wide angle 2. Very little chromatic aberrations 3. Poor image quality at the corners (not even close as sharp as the L series) when you see the pictures at 100% 5. Sharper at the center.
Conclusion: This lens has a fairly steep learning curve compared to most. On a FF it vignetts (sp?) if the filter/lenscap holding ring is left on, for example. It took me a while to really appreciate what this can do for me. I wanted a low level shooting position and a wide view for certain landscape type images I had in mind and this lens did the trick, even when used on 5D2 - the full frame. 12mm is awesome! It's a huge change from 16mm.
Pros: Excellent color and very good sharpness, even at 12mm. VERY nice from 14-24mm. Good low price for the wide view(s). Solidly made.