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
22 May 2012
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: Warte podkreślenia jest podobieństwo osiągów Sigmy 2.8/30 do Sigmy 1.4/30. Z pozoru to zupełnie różne obiektywy, które łączy tylko producent i uzyskiwany kąt widzenia. Mamy przecież zupełnie różne światło, inne gabaryty, inną odległość obrazową i inną konstrukcję optyczną.
Pros: zwarta i dość solidna obudowa,, świetna jakość obrazu w centrum kadru,, przyzwoita jakość obrazu na brzegu matrycy Mikro 4/3,, niewielka dystorsja,, dobrze korygowana koma,, umiarkowane winietowanie,, cichy, szybki i celny autofokus,, dobry stosunek jakości do ceny.
Cons: trochę za duży astygmatyzm,, zauważalna aberracja chromatyczna,, praca pod ostre światło mogłaby być lepsza.