Purchased a Sigma 35mm March 15th. I immediately noticed AF issues. Sent to Sigma and they did an AF software update. I noticed when I got it back that it was focusing better, but still missing a fair amount. MA of at least -10 is needed, and I am still playing with the lens to see if -10, -12, or -14 works best. it seems that any of those setting will hit from time to time, but none really hits a vast majority of times.
I'm debating on what to do. Do I try and just exchange the lens for another through the retailer? (if i fit into their policy for exchanges) Or, since I've already had to register the lens and had Sigma do an AF adjustment, send it back again for calibration? (no siftware, but actual glass calibration)
Leaning toward sending it to Sigma, but I'm not sure I want to argue with them to end up with a $900 lens that only works properly half the time.
