Tamron SP 70-200mm f/2.8 Di VC USD G2 Lens for F - Manual (Page 21)

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The Model A025 is equipped with an USD
(Ultrasonic Silent Drive) ring-type motor that
delivers excellent responsiveness and control. AF
speed is significantly improved from the current
model, and it enables accurate high-speed focus
even when capturing moving subjects.
When shooting with AF, the Full-time Manual
Focus override allows you to instantly make fine
focusing adjustments manually, without having to
switch between modes.
Faster AF and better response