A priori c'est pas le même système, mais ca fait pareil (Rapide et silencieux)...
Citation Envoyé par Tamron
Tamron’s new PZD (Piezo Drive) autofocus technology delivers silent, high-speed autofocus in a compact lens
Ultrasonic motors are divided into two categories depending on the principle that generates the energy to move the drive: traveling wave motors and standing wave motors. Traveling wave motors include the ring-type ultrasonic motor used in the recently launched SP 70-300mm VC USD as well as other lenses, but this lens employs a newer technology, the PZD (Piezo Drive), which functions on the standing wave principle.