A question of compensation - August
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07-08-10, 04:52 PM
Join Date: Jul 2009
Originally Posted by
Just to satisfy a yearning in me for a last dot on the "i" and cross on the "t" - Please define a "stop" - I thought that was relating to "F" stop - The aperture set on the lens?
It's half or twice the amount of light and it doesn't just refer to the aperture (although when people talk about "stopping down" they do mean the lens).
Aperture-wise f/4 lets twice the amount of light through that f/5.6 does. f/5.6 lets through twice the light of f/8 etc.
Shutter speeds and ISO also work the same. 1/500th of a second is exactly twice as much light as 1/1000th of a second. ISO200 is twice ISO100. ISO400 is twice ISO200 etc.
I wrote a tutorial on this (and I'm going to link to it twice in 1 day!) which you can read
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