06-19-2014, 11:09 PM
No, they are not "worse" Klaus. Shall I post an overview of the AFMA for my lenses? It doesn't make a lot of sense, others would show other values. Ranges are from -10 ... +14 and those extremes are Nikkors. 11 lenses and 4 of them Sigmas. And the Sigmas are usually very close to 0. If anything, the Art series is more accurate than the genuine Nikkors.
If you're referring to the reliablity of AF, it's a different story but I would not say the rate of missed focus is significantly lower with Nikkors
If you're referring to the reliablity of AF, it's a different story but I would not say the rate of missed focus is significantly lower with Nikkors