The Tamron 18-270 mm f/ 3.5-6.3 Di II VC PZD
Diagonal angle of view 75° 33’- 5° 55’ (for 1.55x)
Max. magnification ratio 1:3.8 (at 270 mm)
Length 88-96.4 mm
Diameter 74.4 mm
Petal hood included
No VC for the Sony bayonet mount
The Tamron 18-270mm F/3.5-6.3 Di II VC PZD (Model B008) is the lightest and the most compact stabilized universal 15x ultrazoom lens. It features the first piezoelectric drive (Piezo Drive, PZD) autofocus and is intended for small format digital SLR APS-C/DX cameras only (not for FF cameras).
The lens differs from the previous 8-270mm F/3.5-6.3 Di II VC model not only in a new motor with improved piezoelectric design, but also in decreased mass and dimensions. Filter diameter is reduced to 62 mm as well.
The new ultrasonic PZD motor employs a standing wave mode to extend and turn the piezoelectric element along elliptical trajectory by means of high-frequency friction. Ordinary ring-type USM or USD employs traveling wave mode for turning a circular arc. The use of PZD makes it possible to decrease the lens dimensions.
The new lens utilizes an altered construction design of the vibration compensation mechanism, which has also resulted in dimensions and weight reduction. Instead of a moving magnet a lighter moving coil mechanism is used to decrease drive load.
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Posted by: dv Date of publication: 09.12.2010