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For those who use the sunny 16 rule

There are also apps for that.

[URL="https://itunes.apple.com/us/app/sunny-16-exposure-calculator/id527262251?mt=8"[/URL]

[/URL]https://itunes.apple.com/us/app/sunny16-exposure-calculator/id520156440?mt=8[/URL]
 
I just use an EV guide table and do the calculation myself. I've noticed a few sources disagree a bit on some light levels.