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Message: <blockquote data-quote="hark" data-source="post: 680431" data-attributes="member: 13196"><p>I made the mistake of only testing the lens at f/4 (long end) while I was at the store. Figured it would give me an idea of its sharpness. And it seems fine there. However, I didn't try it out at f/10 which is an aperture I use regularly. Nothing shot at f/10 is sharp. It isn't front or back focusing...it just isn't sharp anywhere in those images. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite3" alt=":(" title="Frown    :(" loading="lazy" data-shortname=":(" /> I've never experienced this. My main 3 lenses are all great at f/10 so it never dawned on me.</p></blockquote><p></p>