my A* 400/2.8 is designed to not matter, so i don't have any filter in it. i would expect slight loss of sharpness in the FA* lenses that specify a filter must be installed at all times.
Herb... ----- Original Message ----- From: "Kenneth Waller" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Monday, December 06, 2004 7:10 PM Subject: Re: another filter question: FA* 300mm F2.8 > And have you observed the difference with & without the "middle filter" in > place?
