> >>What am I missing? Where do you get the information to >make >>the EV11 call, Brian ? > >I'm wondering as well, as about when he was posting that I was >about to post that it was +14, which was three stops >different. I just dug up (thanks to Google) a calculator >here: > >http://www.giangrandi.ch/optics/lenses/expcalc.html > >And it gives 13.9. Now the lens focuses wide open and the >comment was in the AF usage sense, so at F5.6 you get about >EV+.3 more for focus. > >
That calculator doesn't seem to movethe EV when you change ISO. The Luminance changes, but not the EV.