Nice lens, not without errors

Looking for a bright lens, I came across the Sigma 30mm 1.4 type and ordered it to me right here. First impression: very solid construction and good quality. Everything so far as chic, but with a lens there is indeed primarily to the inner values, so the image quality and functionality. The image quality is very good in general. At maximum aperture unfortunately somewhat blurred, especially when compared with the Nikon 35mm 1.8, but slightly dimmed the images are sharp crack. Unfortunately, I also sometimes very strong color fringes are noticed to f2 aperture. The colors are very pleasant, the images have a nice "softness" or silkiness despite sharpness and bokeh is very good. So far so good. Were that the case, the lens I would certainly get three to four stars.

Big annoyance is that unfortunately a side focus error in the lens was present, which is also not correct. Was the focal point at the center of the autofocus focused absolutely sharp. Shifted to the focus point on the side, the focus was about 4-5 cm behind the targeted object. My request for Sigma has shown that such a phenomenon can not be corrected because it is not a general focus problem that the entire image is the same. Sigma wanted to push the same error also on the camera, a D7100 and has claimed that the objective has not really all that much to do with the autofocus. I should let first time adjust the camera. But now operate all other lenses I own completely free of errors at the camera. For my taste, it makes itself as the Sigma-Service a little too easy. A second objective of the same series showed the same mistake. Now the good piece goes back and I look around for a different lens. A star so deduction for the focus error, and a star deduction for the excuses and dubious service information from Sigma.