Most older lenses had a DOF scale printed on the barrel. The technique for use was to set one of the aperture markings to the infinity focus marker (usually the left hand aperture mark on all the lenses I can recall using), and then you would have acceptable DOF all the way to the opposing aperture mark. Of course, it depended on how the lens manufacturer determined acceptable! Biggest advantage is that it is always with you, no external devices, either battery powered or printed, needed and it relates only to the lens you are using.
John in Brisbane -----Original Message----- From: PDML [mailto:[email protected]] On Behalf Of Eric Weir Sent: Saturday, 18 April 2015 9:25 AM To: Pentax-Discuss Mail List Subject: Re: Depth of field at infinity > On Apr 17, 2015, at 1:03 PM, steve harley <[email protected]> wrote: > > when in the field you may not have a data signal, so when i have time i'll > see if i can find one that can be stuffed into a JavaScript bookmark and work without an internet connection; or you could just print this table to a PDF and store it in Dropbox, or print it and put it in your wallet: > > <http://www.dofmaster.com/doftable.html> Thanks, Steve. There are apps for iOS and Android on this site, too. And a bunch of interesting articles. > there are, of course, also old school "slide-rule" type DoF > calculators that don't require batteries References for any of those? ------------------------------------------------------------------------------------------ Eric Weir Decatur, GA USA [email protected] "You keep on learning and learning, and pretty soon you learn something no one has learned before." - Richard Feynman -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
