Originally posted by pres589 Gary: The reason I never went looking for a Sigma 30 f1.4 are all the stories of poor AF functionality. I think both the 30 EX DG and 30 Art versions are avoided for this reason. The 30 DC DN version that came after the Art for DSLR lenses actually did get pretty decent with AF for cameras like the Sony E-mount APS-C family. And these days they're pretty cheap.
In the end I'm glad I went with the Sigma 28 EX DG instead.
Fair call. I can't say I have any problems with the AF on the Sigma, but I shoot mainly outdoors, which would be the least difficult for the AF. I didn't really look to buy this lens, it was offered very cheap by the guy from whom I bought the Sigma 17-50mm f2.8, which was also cheap. I would never have bought the 30mm if over AUD$150, since I have the Adaptall2 and the M 28mm f3.5.
Like Pepperberry Farm, I prefer the 24mm focal length on APS-C sensors, or 35mm.