The 30mm on the Nex correspond 48mm full frame, nearly 50mm - so far a classic standard lens which corresponds to the sense of sight and the focal length of the human eye.
That at this price at Sigma still has a lens case with this, is almost like auif the Hamburg fish market, when the eels Dieter drauflegt another.
The autofocus works quickly and accurately with the Sigma, the focus is consistently good, something one, maybe two steps more Blend openings were great .... but hey: what we are talking :; a lens 100, which achieves better results than the 16-60 definitely Kit (let alone 18-55) and in each case for about half the price can be had.
To complain I have the rattle in the lens when the camera is off, but that seems to be so and so you have to live up.
Thumbs up, full buy recommendation and a lot of fun with the fixed focal length.