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Yep a lot of lenses lose quality as the higher end, but you get so much more depth of field at the higher end its a bit of a balancing act. As a rule Id use f8-f11 for something like architecture where the furthest point isn't too far away, but a landscape vista you're probably better off going for f16 or so. A good guide is look at the tech info of really good shots, and see what f stop the pro's tend to use for different scenarios
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