Archived posting to the Leica Users Group, 2001/07/16
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Guys... Whole Stops: 1, 1.4, 2. 2.8, 4, 5.6, 8, 16, 32, 64, 128 All you need to remember is 1 and 1.4. You can rebuild the entire sequence by multiplying every other number by 2. The next f-stop is always the one before last in the list times 2. If this is too much like the college boards write the list down on a piece of paper, put it in your wallet, and go have a single malt. :-) NB This isn't how the math works, it's just a way of being able to built an f stop table without memorizing it. 1 1.4 2=1x2 2.8=1.4x2 4=2x2 5.6=2.8x2 8=2x4 11=5.6x2 16=2x8 22=2x11 Barney Ethel Red wrote: > >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