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So if I shoot with my 50mm 1.8, a F8 would be sharpest? That would negate the bokeh though no?
With newer lenses its very debatable about an f/ stop that high being the sharpest. A lot of zoom lenses are sharpest between f/4 - f/5.6
High quality fast primes as well.
Also keep in mind we're talking about a sharpness difference that you're not going to be able to notice when looking at it on instagram sized replications.
Also keep in mind when you shoot a higher f stop you have to either let in more light through the shutter speed or make your sensor more sensitive to the light by pumping the ISO which could either result in motion blur or added noise. Everything has a trade off.
if max sharpness across the frame is the goal, like for landscapes or shooting street of the hip, that f8-11 range is pretty much where it is at to get the most things in focus & sharp...for portraits that'd probably be unnecessary, you are right though absolute sharpness may indeed by elsewhere (likely lower) in the fstop range...