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 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 > >