First a note on some of the qualities that other reviewers have attributed to this lens. Focusing the lens is primarily the job of the body contrast detection system, not the lens. The part where the lens comes into play is the focus motor and focus elements. Complaints about slow focusing are mostly related to the contrast-detection system (DSLRs use a phase-detection system, which works faster). However, I think this is sufficient for most recordings. If you want to shoot faster, point your camera at your subject area and press the shutter button halfway (this will focus). Then, when you decide the subject is ready to shoot, press the button all the way down. It will be almost instantaneous. The aperture ratio of the lens corresponds to full zooms from Tamron, Tokina and Co. The old principle "quality, price, speed - choose 2" applies. In this case Olympus has gone for reasonable quality and price - if you want speed (a faster lens) you have to be prepared to spend a lot more. However, the news is not that bad. Olympus Micro 4/3 cameras can produce very good images up to 1600 ISO. So set your camera to Auto ISO and it will change the ISO in favor of lower aperture settings to let in more light. Recording video with this long focal length camera requires a different technique than using a traditional camcorder. By keeping your elbows close to your chest so your forearms form an inverted V, the camera can be held steady enough that camera shake isn't an issue. As for my own experience with the lens, I find it quite acceptable for a full range zoom. Image quality is better than expected and the motor/focus elements move fast enough to work with body contrast focusing. It's mostly high-impact plastic, but the build quality is good and unless you give it to the monkeys it should last a long time. The actual lens elements are quite good, with few distortion or chromatic aberration issues throughout the zoom range. I currently live in Hawaii and really enjoy using this lens as my everyday hiking lens when shooting landscapes, movies of my granddaughter playing in the pool and the local flora and fauna.
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