how does the A* 600 f5.6 perform wide open and why did you pick this one over any of the 600 f4 lenses? the price difference isn't that large once you have decided to spend that much.
Herb.... ----- Original Message ----- From: "Bill Sawyer" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Friday, March 26, 2004 6:42 AM Subject: RE: tele extenders > I have the 600 f5.6, Herb. What would you like to know?
