Overall a good and useful lens that exceeds expectations and value
3 weeks ago
Summary: I would have loved a 500mm Nikon lens, however I settled on this lens from Sigma and have been very pleased with the decision. Having a range of 150-500 mm the lens gives me the reach that I wanted in wildlife photography. The lens though by no means light is easily managed and the anti vibration system works well even at 500mm, though if you can, I would use a mono-pod or tripod.
Excerpt: I got this lens just prior to taking a trip to Borneo. I first took it to the zoo as a warmup exercise and was really happy with the results. It is a big and heavy lens though, with cheap-ish casing and there is no getting around that. In comparison the Canon 100-400 f4-5.6 is much more compact, is lighter, and has a more rugged build. I would probably recommend that lens over this one for backpacking photographers. But its also twice as expensive.
Pros: Consistent Output, Fast / accurate auto-focus