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<blockquote data-quote="Horoscope Fish" data-source="post: 707400" data-attributes="member: 13090">The Nikon in-camera focus calibration only allows me to enter a single adjustment for any particular lens while the docks, from both Sigma and Tamron, allow me to enter corrections at three focal-lengths and at three different focusing distances (on this particular lens). In my experience that makes a world of difference. Two other reasons I'll sometimes send lenses back to the &quot;mother ship&quot; for calibration are 1) the equipment they have is much more sophisticated than the dock, which I've found gives better results and 2) because I can do other things while the service center does the calibration instead of me having to spend a day doing it myself and get nothing else accomplished. I also loathe doing AF calibration... It's just a royal pain in the patoot to setup and do correctly......Both Tamron and Sigma have calibrated lenses for me in the past and with one notable exception, when the calibration didn't seem to &quot;take&quot;, I've always been very happy with the results. I don't expect things will be any different this time around but if they are, you'll be hearing about it!</blockquote>

[QUOTE="Horoscope Fish, post: 707400, member: 13090"] The Nikon in-camera focus calibration only allows me to enter a single adjustment for any particular lens while the docks, from both Sigma and Tamron, allow me to enter corrections at three focal-lengths [I]and[/I] at three different focusing distances (on this particular lens). In my experience [I]that[/I] makes a world of difference. Two other reasons I'll sometimes send lenses back to the "mother ship" for calibration are 1) the equipment they have is much more sophisticated than the dock, which I've found gives better results and 2) because I can do other things while the service center does the calibration instead of me having to spend a day doing it myself and get nothing else accomplished. I also loathe doing AF calibration... It's just a royal pain in the patoot to setup and do correctly. [COLOR="#FFFFFF"].....[/COLOR] Both Tamron and Sigma have calibrated lenses for me in the past and with one notable exception, when the calibration didn't seem to "take", I've always been very happy with the results. I don't [I]expect[/I] things will be any different this time around but if they are, you'll be hearing about it! [/QUOTE]

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