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Why so many bad copies?
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<blockquote data-quote="BackdoorArts" data-source="post: 766271" data-attributes="member: 9240"><p>The larger the range the more difficult it is to keep the optics optimal throughout. That balance can be tricky and extremely minor differences in components can add up to issues after final assembly. I think we're at a place where companies are striking a tricky balance between cost and quality and if they're living on a knife's edge then it results in the occasional (or frequent) dog.</p><p></p><p>Despite 'pup's whining, pro reviews take into consideration corner-to-corner and edge-to-edge optics and are extremely valuable to those of us who value an experienced opinion more than our own. </p><p></p><p>I'd been thoroughly happy with a lens I'd used early on and then my brother shot with it and the first thing he says is, "Yeah, it's soft in the corners", and sure enough it was. An amateur is likely concerned with the sharpness of their subject, which will likely occupy the center and strongest point of the lens. A pro knows that there are times when they'll need those edges to be just as sharp. I've heard about occasional issues with the 300mm and 500mm PF lenses, and almost always by folks with a D850. Why? Because the sensor is incredibly good and it's full frame. I have no way of knowing if my copies have issues as they've always only been bolted to a D500 which grabs the center 44% of the frame - which <strong><em>better</em></strong> be sharp (and oh yes, they are).</p></blockquote><p></p>
[QUOTE="BackdoorArts, post: 766271, member: 9240"] The larger the range the more difficult it is to keep the optics optimal throughout. That balance can be tricky and extremely minor differences in components can add up to issues after final assembly. I think we're at a place where companies are striking a tricky balance between cost and quality and if they're living on a knife's edge then it results in the occasional (or frequent) dog. Despite 'pup's whining, pro reviews take into consideration corner-to-corner and edge-to-edge optics and are extremely valuable to those of us who value an experienced opinion more than our own. I'd been thoroughly happy with a lens I'd used early on and then my brother shot with it and the first thing he says is, "Yeah, it's soft in the corners", and sure enough it was. An amateur is likely concerned with the sharpness of their subject, which will likely occupy the center and strongest point of the lens. A pro knows that there are times when they'll need those edges to be just as sharp. I've heard about occasional issues with the 300mm and 500mm PF lenses, and almost always by folks with a D850. Why? Because the sensor is incredibly good and it's full frame. I have no way of knowing if my copies have issues as they've always only been bolted to a D500 which grabs the center 44% of the frame - which [B][I]better[/I][/B] be sharp (and oh yes, they are). [/QUOTE]
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Why so many bad copies?
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