Imagine the frustration of lining up a perfect shot of a bald eagle atop a distant pine tree only to see it fly away as your camera struggles to lock on. Fast autofocus: The contrast-detection autofocus systems that many superzooms employ sometimes struggle to focus at their longest zoom settings, where contrast can be reduced.Most of these systems are optical, meaning they use gyroscopes and moving pieces of glass within the lens to counteract your hand movement, but some combine optical image stabilization (OIS) with electronic image stabilization (EIS) for even more powerful results. Effective image stabilization: Since it’s very difficult to shoot clear photos at long focal lengths, superzooms require sophisticated image-stabilization systems.This time around, we extended the category to include shorter (yet still long) lenses with other desirable attributes, such as a wide aperture throughout the zoom range. A powerful lens: In past iterations of this guide, “powerful” meant a lens with 60x or greater zoom.
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