Archived posting to the Leica Users Group, 2004/02/17
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Sorry mate, this is the same person with the same reasoning. DOF varies because he is allowing objects equidistant from the plane of focus but at different magnifications to be directly compared. Once the magnification is equal, the DOF difference disappears -- which he also demonstrates BTW. His statements are not wrong, you are just incorrect in thinking they refute my mine. John Collier On Feb 16, 2004, at 11:18 PM, Jacques Bilinski & Barbara Bradbury wrote: > Here's another site which addresses this subject: > http://www.vanwalree.com/optics/misconceptions.html > It states "In particular when the object distance is not small > compared with > the hyperfocal distance, a short-focus lens will irrefutably offer > more DOF > than a long-focus lens - at the same F-number and image > magnification." So > according to this a shorter focal length can offer more DOF at the same > magnification. - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html