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Quite right, Stephen...... I'd only add that, if the focus is sharp on an object about two-thirds into the scene, the depth of field will bring the maximum sharpness to the whole scene.
Put it this way..... if you're photographing a mountain ten miles away and you focus on the mountain, a lot of the foreground will be outside of the sharp zone - a bit blurry. With a sensibly small aperture like f/11 or smaller (don't forget, higher number = smaller aperture) focus about 2/3rds in and you'll have everything sharp.
That's not to say that more sharpness is always required in a landscape - you could focus on, for instance, a tree in the foreground. Open up the aperture - f/5.6 and below - and your mountain in the background could become more blurry - and more abstract, yet just as identifiable as being 'mountainous scenery'.
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