Many of your preceding posts are not showing any pictures(?)Go back one page where my 3 cameras are and you can see the chip just above what looks like a bubble.I over think things sometimes,i will just test shoot and be done with it.Besides the sigma actually covers a good range and i like the looks of pics using sigma lenses. I got 10 cameras and lenses rolling around in that grey matter right now,8 new in the last 1 1/2 months,lol.As i said over thinking.Time to take a deep breath.Thankyou.