zoom lenses

Compared with fixed focus lenses, zoom lenses have variable magnification without adjusting their position so that they can image with different resolution and enhance effectively their target detection efficiency.

与定焦镜头相比，变焦镜头的放大倍率可变，无需调整光学系统的位置便可以不同分辨率对目标成像，能有效提高探测效率。

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Concerning the Vignetting Coefficients in the Optimization Design of Zoom Lenses

关于变焦系统优化过程中渐晕系数问题的讨论

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According to the comprehensive evaluation of the final optical system, this structure could achieve the requirements of large field zoom lens in the digital camera. All the lenses composing the zoom system are spherical lens, so the production cost could be reduced effectively.

评价结果表明，这种结构形式可以实现大视场要求的数码相机变焦距物镜设计，组成系统的全部镜片都为球面透镜，使加工变得容易，降低生产成本。

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According to the theory of optical compensated zoom, author designed optical compensated step zoom lenses.

根据光学补偿变焦距理论，作者设计出光学补偿式步进变焦物镜。

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A built-in flash eventually became the norm for disposable cameras, and some even used a pair of lenses to create a manual zoom.Disposable cameras didn't take over the photography market, but they absolutely cornered the tourism industry.

内置的闪光灯成为了一次性照相机的标配，甚至有的相机还使用一组透镜，形成手动可变焦距镜头。虽然一次性照相机并没有考虑摄影市场，但他们却以绝对性的优势垄断了整个旅游行业。

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