Compact and Easy to Carry 15X All-in-One Zoom with Outstanding Feature Set
The 18-270mm Di II VC PZD boasts the worlds highest zoom range at 15x
magnification for a lens with its compact size and light weight, with the added
value of Tamrons proprietary VC (Vibration Compensation) image stabilization.
At 15.9 ounces, measuring 3.8 inches in length (from mount face to the tip of
the lens), and 2.9 inches in diameter with a filter diameter of 62mm, its a
compact and easy-to-carry lens. A minimum focusing distance of 19.3 inches
throughout the zoom range and a maximum magnification ratio of 1:3.8.
PZD (PIEZO Drive)
Tamrons 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.
A standing wave ultrasonic motor utilizes high-frequency voltage to extend and
turn the Piezoelectric (Piezoceramic) element, thus moving the entire element in
a standing wave movement. The metal tip is the contact point of the element to
the rotor, and moves in an elliptic motion from the swiveling motion of the
moving element, and the friction from this motion turns the rotor. Standing wave
ultrasonic motors have the distinct advantage of being smaller than their
traveling wave counterparts, and therefore allow a more compact SLR lens size.
VC (Vibration Compensation)
Tamrons VC mechanism employs a three-coil system, whereby three driving
coils activate the shake-compensating VC lens group electromagnetically via
three steel balls. The VC lens elements are held in place only by contact with
the steel balls, achieving smooth movement with little friction. This provides a
stable viewfinder image with excellent tracking performance that eliminates the
blur from handheld shots for cleaner, crisper shots.
New VC Mechanism (Moving Coil Method)
Tamrons original VC image stabilization mechanism utilized a moving magnet
system whereby a heavy magnet was positioned near the moving VC lens element. In
the new VC unit, the positions of the magnet and the coil are reversed, and
because of this, the VC optical lens element is attached to the coil. The new VC
mechanism employs a moving coil mechanism with a lightweight coil, and the
lighter coil reduces the load on the drive system. Thus, the lighter, more
compact new VC unit contributes to the lenss overall light weight and compact