I was really excited the other day getting a great price from Abes of Maine on the Sigma 17-50 2.8. I took advantage of the coupons and it arrived today. Super excited and i put it on the camera. Went to take a pic and it made strange noises hunting for focus. Just kept hunting and at times sounded like it was going to die. When it did focus it didnt focus correctly.
I changed to my Sigma 10-20mm and it focused flawlessly in the same light level. Tried the kit 18-55 and that focused great too. Tried the 17-50 again and again hunted and hunted, the auto focus sounded nothing like the HSM on the 10-20mm.
Has anyone else had this issue. In research i never came across this. Needless to say its going to be returned. Pretty bummed right now.