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Lenses
Telephoto
Focus tuning a 70-200
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<blockquote data-quote="BackdoorArts" data-source="post: 264579" data-attributes="member: 9240"><p>It's not uncommon on zooms. The problem is, you can only fine tune to one point ... unless you have a newer Sigma with a USB dock which allows for 4 point tuning across the zoom range (<strong><em>are you listening, Nikon?!</em></strong>). Frustrating, I know. </p><p></p><p>I tend to tune zooms at the long end if only because Depth of Field is minimized there at small apertures so tuning is more critical (a 70-200mm lens will have about 3" of DoF at 10 feet at 200mm f/2.8, but a full foot of DoF at 70mm f/2.8, so even if you're off a bit it may be masked).</p><p></p><p>Still, I would contact Tamron and/or the purchase location and see about swapping out lenses.</p></blockquote><p></p>
[QUOTE="BackdoorArts, post: 264579, member: 9240"] It's not uncommon on zooms. The problem is, you can only fine tune to one point ... unless you have a newer Sigma with a USB dock which allows for 4 point tuning across the zoom range ([B][I]are you listening, Nikon?![/I][/B]). Frustrating, I know. I tend to tune zooms at the long end if only because Depth of Field is minimized there at small apertures so tuning is more critical (a 70-200mm lens will have about 3" of DoF at 10 feet at 200mm f/2.8, but a full foot of DoF at 70mm f/2.8, so even if you're off a bit it may be masked). Still, I would contact Tamron and/or the purchase location and see about swapping out lenses. [/QUOTE]
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Focus tuning a 70-200
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