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Message: <blockquote data-quote="BackdoorArts" data-source="post: 551226" data-attributes="member: 9240">I have the Sport version of that lens and I was definitely underwhelmed at first by the OS compared to other Sigma lenses I have.  But with the USB dock I was able to set one of my custom settings to a more aggressive OS and it's much better.  I also applied all the firmware upgrades.  If you don't have the dock it's worth the get since you have the lens, both for being able to customize OS and AF settings, and particularly for the 16 point AF fine tuning.  And you'll never need to send it in for a firmware upgrade. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile    :)" loading="lazy" data-shortname=":)" /></blockquote>