Updated Tamron 18-270 announced.

[tkbslc]

Tamron just announced a new 18-270 model with "PZD" AF. Seems odd that it isn't USD like their new 70-300. ANyway, it's avaialble in like a week:

http://www.tamron.com/en/photolens/d..._one/b008.html

"The acclaimed Tamron 18-270mm VC ultra zoom for APS-C format DSLRs has reached an astonishing new level of compactness, performance, and speed with the addition of PZD (Piezo Drive), an innovative ultrasonic autofocus motor based on an advanced piezoelectric design. The result is a lens that's considerably lighter, and noticeably shorter and slimmer (filter diameter: 62mm) than any previous lens in its class, and provides faster, quieter auto-focusing. Signature features that have made this amazingly versatile lens the world standard in its class have been retained. They include a 28-419mm equivalent (15X) zoom range, an improved, lightweight, compact Vibration Compensation (VC) system, macro focusing to 0.49m (19.3 inches) throughout, and, of course, superlative imaging performance."

One cool thing is that it seems to be roughly the size of the old Tamron 18-200, which was really compact.

[nepali]

Originally Posted by tkbslc

Tamron just announced a new 18-270 model with "PZD" AF. Seems odd that it isn't USD like their new 70-300. ANyway, it's avaialble in like a week:

http://www.tamron.com/en/photolens/d..._one/b008.html

http://photography-on-the.net/forum/...d.php?t=969701

[gasrocks]

Gee gosh.

[themadman]

To save you all the trouble

From Wikipedia

Piezoelectric motors

Types of piezoelectric motor include:
The travelling-wave motor used for auto-focus in reflex cameras
Inchworm motors for linear motion
Rectangular four-quadrant motors with high power density (2.5 watt/cm3) and speed ranging from 10 nm/s to 800 mm/s.
Stepping piezo motor, using stick-slip effect.
All these motors, except the stepping stick-slip motor work on the same principle. Driven by dual orthogonal vibration modes with a phase difference of 90°, the contact point between two surfaces vibrates in an elliptical path, producing a frictional force between the surfaces. Usually, one surface is fixed causing the other to move. In most piezoelectric motors the piezoelectric crystal is excited by a sine wave signal at the resonant frequency of the motor. Using the resonance effect, a much lower voltage can be used to produce a high vibration amplitude.
Stick-slip motor works using the inertia of a mass and the friction of a clamp. Such motors can be very small. Some are used for camera sensor displacement, allowing anti shake function.

[tkbslc]

Originally Posted by nepali

http://photography-on-the.net/forum/...d.php?t=969701

I swear I looked.

[nepali]

Originally Posted by tkbslc

I swear I looked.

LOL!