Archived posting to the Leica Users Group, 2001/07/16

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Subject: [Leica] Posting of Kyle Cassidy
From: "S.K.Boyd" <shortymx@compaq.net.mx>
Date: Mon, 16 Jul 2001 16:49:54 -0500
 
In Kyle's posting he said:
"fwiw, f 1.0 is NOT one stop faster than f 1.4, it's only a third of a stop
faster. so unless you're looking at your images and shaking your head
saying "damit! it's a third of a stop underexposed!" you're okay with your
summilux"

Sq root of 2 = 1.414 X 1 = 1.414 or f1.4

f1.0 is 1 full stop more that f1.4.  How do you get only 1/3 of a stop?

Stu