that is of course possible but if the aperture is inconsistant size every time it stops down to either take a picture or take a meter reading the error would be there regardless of whether the metering technique is stop down or open aperture so your caveat does not apply. Its another source of error for BOTH metering techniques. JCO
-----Original Message----- From: William Robb [mailto:[EMAIL PROTECTED] Sent: Thursday, November 04, 2004 5:03 PM To: [EMAIL PROTECTED] Subject: Re: Stop Down Metering on K, M, LX ----- Original Message ----- From: "J. C. O'Connell" Subject: RE: Stop Down Metering on K, M, LX > That said, ASSUMING THERE IS ENOUGH LIGHT, stop down metering will > always be more accurate than open aperture metering I am going to throw a caveat on this statement. The presumption being made is that the lens is either being stopped down, metering is done and then the shot is made without opening the aperture back up, or that the lens will stop down to precisely the same point when the picture is taken, in the case of metering such as what must be done with the istD and a non A lens. If you stop down meter, then open the lens up for final composition and then take the picture, there may well be a variance in the aperture size between metering and exposure. William Robb
