Lens with strengths and weaknesses light.

I use the Sigma lens on a Nikon D 5100 and have the kit lens 18-105 VR Nikon 3.5-5.6 replaced by the Sigma. With the restriction of the focal length I can live quite well, for me the erhofte improving sharpness and the higher light intensity were decisive. The lens is significantly high processed by feel than the Nikon. However, the handling requires a short transition, since the direction of rotation of the focal length setting on the zoom ring exactly opposite from Nikon. Furthermore, it is a bit strange that the front Focusierring always rotates even when autofocus. Yet another note compared to the Nikon can be rotated significantly tighter the zoom ring at Sigma. The details mentioned require a short familiarization or conversion are but in the sense not a disadvantage. Included is a sun visor (very useful), a lens case to protect is not supplied. Fast delivery and relatively good price on Amazon.

Note, by online registration on the Sigma website a warranty extension to 3 years is possible.

Update 10.2013:
After prolonged use me some weaknesses are but fallen on. The supplied lens has on my Nikon D5100 a back focus, which is after all turned out very clearly, especially in wide angle, this makes course in landscape photography by blurring noticeable. My guess was confirmed by a test setup with test chart. Unfortunately, the Nikon D 5100 has no internal AF fine tuning! Written Konktakt with the Sigma Customer Service brought me two options. 1. Returning the lens including camera or correction of AF using the Sigma USB dock, which is available as an accessory for 49 Euro. The USB dock with the free software allows recalibration of the lens on the computer. This path, however, is very time consuming and requires a certain experience. The advantage is obvious you learn the strengths and weaknesses of the objective know. Fun with the objective to make portraits and macro shots easy, more difficult it will be there for landscapes it shows slight weaknesses.