Archived posting to the Leica Users Group, 2008/12/13
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Hi, Mark, Glad we can agree. Especially since the HP that I use makes use of a reverse-Polish notation system. ;-) Jim Nichols Tullahoma, TN USA ----- Original Message ----- From: "Mark Rabiner" <mark@rabinergroup.com> To: "Leica Users Group" <lug@leica-users.org> Sent: Saturday, December 13, 2008 8:52 PM Subject: Re: [Leica] Re: Half stop! > > 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 > > > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information > >