Archived posting to the Leica Users Group, 2011/11/03
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]On Nov 2, 2011, at 5:32 PM, Mark Rabiner wrote: > I looked up f 1.8 vs. 1.4 thinking it was between a half and a quarter of a > stop and they are saying its 2/3rds!?!?! Anybody know that that's true? > > Where is there a photo calculator that tells you these things?!?!? I always thought the basic math for 1 f stop revolved around a factor of 1.4. 1.4 x 1.4 = 1.96 1.8 / 1.4 = 1.29 so - yes - 2/3 would seem close enough for? what? I'm not sure. Regards, George Lottermoser george at imagist.com http://www.imagist.com http://www.imagist.com/blog http://www.linkedin.com/in/imagist