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Message: <blockquote data-quote="Dimson" data-source="post: 236121" data-attributes="member: 18281">it's not always about shooting at sweet spot settings. it's about shooting at settings which best suit the subject. for the vast majority of the lenses, the sweet spot is around f/8-11 on FX body and around f/6.3-8 on DX body.on many occasions, sharpness alone has very little meaning. other than that, there can be slight deviations between different lens copies, and the resolution curve may vary slightly.for example, prior to my move to Nikon, i owned a Canon 17-40 f/4L lens which was slightly sharper both at the center as well as in the corner at f/16 than at f/11. go figure...</blockquote>