Archived posting to the Leica Users Group, 2004/02/16
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]It is not rocket science folks. DOF is an illusion. There is only one plane of sharpness. It is an effective illusion none-the-less. Perceived DOF depends on these factors: 1) size of the aperture 2) actual object magnification 3) lens/medium performance That is it. Nothing else matters 1) The size of the aperture is something we all should easily agree on. Large aperture means narrow DOF and small aperture means large DOF. I cannot remember, and am too lazy to look it up, if it is the relative aperture (the F number) or actual aperture (physical size) that is the important one but someone will chime in I am sure. 2) This takes into account focal length, focused distance, enlargement and viewing distance. 3) Soft lenses, small sensors, coarse film all reduce the output resolution which makes small changes in sharpness difficult to discern therefore increasing the apparent DOF (A wider band of crap so to speak). Sharp lenses, large sensors, fine film all increase the resolution which makes small changes in sharpness easily apparent therefore smaller apparent DOF. John Collier Oh how I dread the inevitable rebuttals. Please, please, please do your research before you open your mouth and prove yourself an... - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html