They offer clearer and sharper images. Many of them also have up to 20x optical zoom lens, a photo mode and fast-action mode.

它们的画质更加清晰分明。其审很多款产品带有高达20倍的光学变焦镜头，并且有照相模式和速拍模式。

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The coherent output of a LDA has been achieved by a simple EC consisted of a commercial LDA, a fast axis collimation lens and an external mirror.

我们用一个普通的商用LDA、一个快轴准直透镜和一个外腔镜构成的简单外腔实现了LDA的外腔锁相运行。

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In geometry optics basic content is asks the picture, the paper through to the physical image position relations analysis, obtains the fast judgment lens image formation rule the method.

几何光学中的一个基本内容是求像，本文通过对物像位置关系的分析，得出快速判断透镜成像规律的方法。

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At F2.8-4 wide open, this fast lens is perfect for low-light photography or scenes beckoning a beautiful bokeh effect.

ENGADGET: Fujifilm grows X-series mirrorless lineup with 16.3-megapixel X-E1

The camera captures images in a wide variety of settings and its fast lens makes creating beautiful focusing effects and bokeh achievable, enabling heightened creative expression and artistic personalization.

ENGADGET: Pentax launches brass-bodied MX-1 point-and-shoot: 12MP with 4X zoom (update: now with hands-on photos)

This is a very fast camera in every respect (bar an occasional lag writing RAW files to memory) with a tack-sharp, super-fast lens, pleasingly fast autofocus, a great, bright screen, and rock-solid feeling controls that are right where your fingers need them to be.

FORBES: The Electric Barnack Acid Test: Shooting On The Street With The Leica D-Lux 6