Delivery time and high quality; as always, thank you AMAZON. Objective brand SIGMA therefore produces consistent with my expectations: excellent quality. very good quality / price ratio. 150 - 500mm: it's downright magical! wide focal range, many possibilities, great for animal pictures, and even astronomical nickname (the moon burst the screen ...) minimum opening F5: that's enough for the outside. I rode on a SONY A55; autofocus works very well with very little noise (capital for animals ...) one downside: it's heavy! a monopod or tripod is necessary, but ... I knew. I'm not at all disappointed and even quite satisfied. I recommend
