Archived posting to the Leica Users Group, 2000/03/06
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]...or 1/5th of a stop!...Now, I know this may seem a bit odd...But back before everyone explained all the fancy dancy mathematical calculations to me which I still don't understand, I did some calculations of my own...I figured, 2.0 - 1.4 = .6...Now, if it's a full stop between 1.4 and 2.0, a 1.5 lens would be 1/6th of a stop less than 1.4...which ain't far from 1/5th...of course as this calculation method varies between every f stop, it's probably not terrifically accurate..:-) B. ecause I never D.id well in math. - -----Original Message----- From: owner-leica-users@mejac.palo-alto.ca.us [mailto:owner-leica-users@mejac.palo-alto.ca.us]On Behalf Of Larry Kopitnik Sent: Monday, March 06, 2000 10:30 PM To: leica-usersmejac.palo-alto.ca.us Subject: RE: [Leica] 50mm f1.5 Nokton question >>>>>>>>>> I'm curious...How does one calculate these "stop fractions?" <<<<<<<<<< There's a nifty little calculator you can download that does all sorts of photography-related calculations. The Windows version can be downoaded from http://www.cyberport.com/~tangent/photo/fcalc/index.html and there's a link at that site to a Mac PowerPC version. According to this calculator, 1/10 stop past f/1.4 is f/1.45. f/1.5, it says, is 2/10 stop. Larry