Cool, thanks Patrick!
Yeah, trial and error also gets you used to which settings to use for a desired result, so you can do it on the fly. Another really useful tip is to google DOF calculator. Check out the charts for your particular lens and you can see the DOF in actual measurements. For instance, if I'm shooting a portrait using my 85mm f/1.8, I know that if my subject is 4 feet away, the DOF or sharp plane of the image is only maybe 1/2 inch at f/1.8. So if I want the subjects entire face from nose tip to back of ears in focus, I'd have to shoot at around f/11ish. Knowing this helps you pick the right settings for your desired result.
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