Quote Originally Posted by brucemuir View Post
The Sigmas are notorious for having chips in there that just dont play nicely across the board.
I've seen this nmost often with Canon but it stands to reason the same problems exists.
I 'll dig out the 24 and 70-200 and see if it is across the board with the Sigmas. I do like them, f2.8 and lot heavier than the G.