Archived posting to the Leica Users Group, 2001/07/16
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]>From: Kyle Cassidy > >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... Sorry Kyle. f:1 is indeed a full stop faster. Do the math. Just as f:2 is two full stops faster than f:4, f:1 is two full stops faster than f:2. f:1 means that the diameter of the aperture is the same as the focal length. It's a fraction actually. f:2 means the diameter of the aperture is 1/2 the focal length. At 1/2 the diameter, the area is 1/4 thereby letting in 1/4 as much light, or two full stops. PJW > _________________________________________________________________ Get your FREE download of MSN Explorer at http://explorer.msn.com