[biei]

請指教!

[initialcs]

USM-Ultrasonic Motor : to achieve critical autofocus, the elements within a camera lens have to move quickly, quietly, and with exacting precision.

Image Stabilizer (IS) : let you capture photos that would otherwise be blurred due to camera movement, greatly expanding the range of handheld-camera photography

http://www.usa.canon.com/html/eflenses/technology/imagestabilizer.html

[biei]

thanks a lot!