The Panasonic PZ 45-175mm f/4.0-5.6 OIS for Micro 4/3rds is a relatively small 3.8x telephoto zoom lens considering it’s range (90-350mm equivalent). The lens features Panasonic’s new Power Zoom technology, which is great for shooting video. The toggle switch on the side of the lens controls the power zoom, yet you still have the manual zoom option if needed. With some Panasonic cameras (not the AG-AF100), you can adjust the power zoom speed in the menu. This offers the user the flexibility of a quick zoom for fast action or a slow, smooth zoom for a dramatic effect.
It also has Panasonic’s Multi-Actuator Floating Inner Focus System, which allows the lens to stay at an overall length of 3.54", regardless of zoom or focus setting. This in combination with a stepping motor and contrast autofocus gives an ultra fast AF telephoto lens for nearly any use. For video shooters, the lens is indeed parfocal, which means no focus pulling while zooming on a static subject is necessary. It uses a nano crystal coating and two aspherical and ED elements for high image quality with ghosting, flare and chromatic aberrations kept to a minimum.
Please Note: While this lens will work with Olympus micro 4/3rds cameras, you will not be able to use the OIS in the lens. It does not have the OIS On/Off switch on the barrel of the lens, which means it will default to Off. You can still use the Olympus Built-In Stabilizer in your camera, but there is no way to use the lens OIS.