For wildlife photography I was looking for a big push, as with 75-300mm no pot to win in Africa. The 50-500 of Sigma was me then too heavy. The alternative: 150-500 mm. Upon receipt I have the lens including Body (Nikon D7000) sent to Sigma so that the autofocus is adjusted perfectly. That worked great. The lens is already at the weight limit for longer hold, but it is quiet in his hand. With maximum aperture also well used, stopped down to 8 and everything is great. Have a good piece now dragged intense three weeks through East Africa and am excited about it. Well, in the early morning light makes the light intensity to be desired, but that is like the Nikon loose again. I am fully satisfied with the sharpness of imaging and optical power. Price / performance ratio: very good. Cloudy, with thousands of dollars more and you get even more performance. But I did not want to invest. The pan handle Eigent very suitable for holding the lens. View Only after several days did the Zoom independently to say, at the inclined camera zoom pulls itself out. But the activated lock prevents this.
