Archived posting to the Leica Users Group, 2002/11/27
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Sorry to burst your bubble, Brad, but hyperfocal focusing has been around as long as there have been focusable lenses and depth of field scales. My copy of the Leica Manual, edition 12, 1951, had a handy dandy algorithm for calculating depth of field. It uses parameters such as circle of confusion, which really isn't as confusing as it sounds, and effective diameter of the lens. If you can find a copy of this manual, probably any edition, look in the chapter on lenses. You will also find an algorithm for calculation hyperfocal distance. This is a handy book for anyone interested in the technical aspect of the equipment, Leicaphiles or otherwise. Dave Richards > okay, i understand how hyperfocal distance works--in fact, i used it > today while walking around scaring the bezeesus out of people on the > streets of chicago by unexpectedly taking their pictures--but what about > hypofocal (???)[1] distance? for instance, say i stop my lens down all > the way, then focus it all the way to the *closest* focusing distance. > i know i have some depth of field *closer* than the plane of focus, but > i don't know how much. > > is there a formula for calculating this? > > [1] i'm totally aware that "hypofocal distance" is probably something i > just made up. if so, i get the neologism of the day award. and for > once, a new word and/or phrase i created isn't dirty. momma's gonna be > so proud. - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html