Archived posting to the Leica Users Group, 2000/11/08
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]On Wed, 08 November 2000, "M.E.Berube" wrote: > > At 12:56 AM 11/8/00 +0100, Alan Hull wrote: > >So I thought "zone focus" and change to a 35mm lens to increase DOF. > >Which of course is nonsense as DOF has nothing to do with focal length. > > Huh? > Admittedly, I'm not an expert on photo theory and often confuse it all > round, but everything that I was taught, and my brief 20 years experience > hath shewn, that lenses of short focal length produce greater depth of > field than do standard lenses at the same aperture. > > Or did I misunderstand? > > Carpe Luminem, > Michael E. Berube DOF has nothing to do with focal length. DOF is influenced by image magnification and aperture. Shorter lenses have greater DOF for a given aperture and working distance because of the reduced image magnification. Doug Herr Birdman of Sacramento http://ourworld.compuserve.com/homepages/telyt - -------------------------------------------------- Stay in touch with Northwestern and the world. Click http://www.nualumni.com to get your FREE Northwestern StartPage. Customize your own collection of the latest news, sports, stock quotes, and more. Check it out today!