There are many free apps for smart phones which will help you quickly calculate DoF for lens/f-number/distance combos. I have one called SetMyCamera, but there are many.
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Okay, here's a little redemption for the Kite Surfer photos I posted earlier in the thread - a little more on the "Waterscapes" topic . . .Nice images ... was the composition of the first image deliberate to give it a "naughty" look? ... I love it
For those of you who are not as immature as I am, just tilt your head to see the first image in portrait orientation