Archived posting to the Leica Users Group, 2008/12/13
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Also known as Postfix notation. Which instead of a slide rule you have little yellow pads; And a gel pen. 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 22:27:05 -0600 > To: Leica Users Group <lug@leica-users.org> > Subject: Re: [Leica] Re: Half stop! > > 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 >> >> > > > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information