Chris Brogden <[EMAIL PROTECTED]> wrote: "I believe it's only a half-stop from 1.2 to 1.4."
Here's how f/stops compare. I don't remember where I got these numbers. I may have derived them, so feel free to question them. f/1.2 is 0.45 stop faster than f/1.4 f/1.4 is 0.62 stop faster than f/1.8. f/1.4 is 1.0 stop faster than f/2.0 f/2.0 is 0.67 stop faster than f/2.5. f/2.5 is 0.33 stop faster than f/2.8. f/2.8 is 0.7 stop faster than f/3.5. f/3.5 is 0.3 stop faster than f/4. f/4 is 0.25 stop faster than f/4.5. f/4.5 is 0.67 stop faster than f/5.6.
