Archived posting to the Leica Users Group, 2000/11/09
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Michael. Please look in your library for books such as Ansel Adams' "The Camera" and other similar books. You can read it there for yourself. DOF is determined by just two factors: final image size and relative aperture used. Perspective is a function of viewpoint only. Lens choice does not enter in at all. Take a picture with the subject filling the frame with your 90 and 35 using the same aperture (you will have to move closer with the 35). Print to the same size and you will get the same depth of field. Now take a picture of any scene with your 90 and 35 without changing position. Print the 90 full frame and crop the 35 to match, identical perspective. Ansel has his answers illustrated and will be much easier to comprehend than anything I can cram into my cable line. John Collier > From: "M.E.Berube" <MEB@goodphotos.com> > > At 06:25 AM 11/9/00 -0800, you wrote: >> If you crop a picture shot with a wide angle lens and then enlarge it >> so it is comparable to a print made through a longer lens, the DOF >> will be the same in both prints. The actual lens doesn't affect DOF. > > um...not to be argumentative, but i disagree... > I am considering DOF to be the point of nearest acceptable focus to the > point of farthest acceptable focus in any given image. Like Perspective, > it is set on the negative as a latent image by your choice of lens and > aperture. Nothing you do to it during or after development of the negative > can change the DOF (or perspective such as apparent background > compression.) You can change Composition and other characteristics (Gamma, > RGB, hue, contrast, etc..) in the wet or digital lab, but Depth of Field, > Focus and Perspective are determined in camera. > > Carpe Luminem, > Michael E. Berube > >