According to the review, a bit disappointed with it 150mm performance and AF accuracy, hope they will come out with a better update version next time, like with Macro?
i just send my sigma 50-150mm for calibration today. great service from sigma! when i first called to make an appointment, i was told they are waiting for some hardware in order to calibrate it. i left my contact, thinking they may not call back. but 2 weeks later, they actually called and arranged an appointment for me! anyway, my lens can focus much much better now. still not very sharp at F2.8 when zoom to 150mm and focus at about 1m. but stop down to about F4 it is sharp