Summary: Clearly this is a lens of contradictions: it has a poor manual-focusing facility but it has a brisk and reliable AF system that records bitingly sharp images. It is also very well priced, which is an added bonus.
Excerpt: Sigma 30mm Micro Four Thirds Lens This 30mm lens is currently available to fit both Micro Four Thirds and Sony NEX cameras and costs around £170. It sports a bright f/2.8 aperture and a newly developed linear focus motor.
Excerpt: The Sigma 30mm f/2.8 EX DN is the closest thing to a “fast 50″ that we can get right now for Sony’s NEX models in the native E-mount. I’ve been playing with it for a couple of days and, in short, I think it’s a nice complement to the 18-55mm kit lens.
Excerpt: With the announcement of Sigma 30mm f/2.8 EX DN, along with its sister Sigma 19mm f/2.8 EX DN, Sigma Corporation has finally made its long anticipated entrance into the mirrorless lens market official.
Sigma AF 30mm f/2.8 EX DN (Sony E mount) - Review / Test Report
9 February 2013
Conclusion: The Sigma AF 30mm f/2.8 EX DN is a cute little fellow but not only that - it's good quality stuff, too. This is especially true for the center performance which is nothing short of breathtaking in the relevant aperture range.
[REVIEW—SIGMA 30mm f2.8 EX DN lens for mirrorless cameras]
4 April 2012
Excerpt: This lens is designed for use on mirrorless system cameras and currently comes in mounts for Olympus/Panasonic micro four thirds cameras and for Sony NEX cameras. The film-equivalent angle of view on the Olympus/Panasonic is 60mm and on the Sony 45mm.
Excerpt: In January 2012 the Sigma company presented two lenses designed for mirrorless cameras - the Sigma 19 mm f/2.8 EX DN and the Sigma 30 mm f/2.8 EX DN. If I have to be honest I admit I was very surprised by that launch.
Cons: a bit too high astigmatism,, noticeable chromatic aberration,, work against bright light should have been better.
Summary: The Sigma 30 mm EX DN is a lens that is comfortable in the hand, finished solidly and which focuses quickly and quietly. For a micro-43 lens, the Sigma 30 mm EX DN is not very compact, but that is precisely an advantage for those who wish to focus manually.
Pros: High resolution in the center, Solidly built and beautifully finished, Free pouch, Low priced
Cons: No built-in image stabilization, Reasonable performance in terms of distortion and chromatic aberration, Resolution in the corners is less than in the center