Archived posting to the Leica Users Group, 2008/12/13
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]On my EPSON CALCULATOR, 3.5 to 2.8 is ALSO about three-quarters of a stop. 4.0 to 2.8 is the normal full stop increase. Same as my CANON Calculator! :) mark@rabinergroup.com Mark William Rabiner > From: Jim Nichols <jhnichols@lighttube.net> > Reply-To: Leica Users Group <lug@leica-users.org> > Date: Sat, 13 Dec 2008 18:46:46 -0600 > To: Leica Users Group <lug@leica-users.org> > Subject: Re: [Leica] Re: Half stop! > > On my trusty HP calculator, 3.5 to 2.8 is about three-quarters of a stop. > 4.0 to 2.8 is the normal full stop increase. Just my 2 cents. > > Jim Nichols > Tullahoma, TN USA > ----- Original Message ----- > From: "Lawrence Zeitlin" <lrzeitlin@optonline.net> > To: <lug@leica-users.org> > Cc: "Lawrence Zeitlin" <lrzeitlin@optonline.net> > Sent: Saturday, December 13, 2008 4:49 PM > Subject: [Leica] Re: Half stop! > > >> >> On Dec 13, 2008, at 12:50 PM, Marc James Small wrote: >> Larry >> >> With respect, it is a third of a stop, not a half-stop. The European >> apertures are 1/3 of a stop different from the International scale which >> has been the norm since the 1950's. >> >> Marc >> >> >> Strange. I get 1.56 times increase in light transmitting power going from >> f3.5 to f2.8. Seems like half a stop to me. Do the math and tell me what >> you think. >> >> Larry Z >> >> _______________________________________________ >> Leica Users Group. >> See http://leica-users.org/mailman/listinfo/lug for more information >> >> > > > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information