Archived posting to the Leica Users Group, 2006/12/07
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Thanks Henning, I knew there was something wrong about my reasoning, however logic it seemed. Philippe Op 7-dec-06, om 23:02 heeft Henning Wulff het volgende geschreven: > At 10:29 PM +0100 12/6/06, Philippe Orlent wrote: >> I was just remembering my ISO scale on the back of my MP: >> 50-100-200-400-800- etc. >> >> But the zones in between are divided in 3 parts. >> >> So between 50-100: 50/3=16,7 >> Between: 100-200: 100/3=33,33, which would put 160 at 100 and 2/3ds >> Two full stops under brings us at >> 400 and 2/3ds >> Which is 400 + (800-400)x2/3= 666,7 >> >> I may be wrong, but it looks like Leica logics to me. >> :-) >> Philippe >> > > ISO is not continuous. It's only defined for the discrete > progression (from 100 to 3200) for 100, 125, 160, 200, 250, 320, > 400, 500, 640, 800, 1000, 1250, 1600, 2000, 2500, 3200. > > No numbers in between, ie, there is not 'ISO 300' or 'ISO 666'. > > -- > * Henning J. Wulff > /|\ Wulff Photography & Design > /###\ mailto:henningw@archiphoto.com > |[ ]| http://www.archiphoto.com > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information >