Aperture= focal ratio = F-number, i.e. F8 , a 50mm lens @F8 @ 1:1 RR has same DOF as 100mm lens @ F8 @ 1:1 RR. (RR=Reproduction ratio) JCO
-----Original Message----- From: Herb Chong [mailto:[EMAIL PROTECTED] Sent: Monday, August 09, 2004 8:59 PM To: [EMAIL PROTECTED] Subject: Re: 50 or 100 mm define aperture. Herb... ----- Original Message ----- From: "J. C. O'Connell" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Monday, August 09, 2004 8:48 PM Subject: RE: 50 or 100 mm > W R O N G ! ! the 100mm will have exact same DOF as the 50mm at the > same magnification and aperture. focal length has no effect on DOF, it > is determined solely by magnification and aperture.
