This method can correct the measurement of the thickness lens focal length lens produced by ignoring the error.

此方法可以修正测量透镜焦距忽略透镜厚度所产生的误差。

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According to the principle of optical measurement, a simple and effective method to measure the distortion of CCD camera with a largefield, short focal length lens is presented.

从光学测量角度出发，结合计算机视觉中的摄像机标定方法，解决了大视场短焦距镜头CCD摄像系统的畸变校正问题。

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Depending on the lens' focal length, the image will deform and affect how the image looks in photos.

根据镜头焦距的不同，图像会随之变形并且会影响最终的照片效果。

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The new FUJINON XF14mm (21mm) F2.8 single focal length lens offers a stunning, ultra wide angle that delivers exceptional resolution from edge to edge.

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

By using this adapter to attach any K-mount lens onto a PENTAX Q series camera, the focal length of the lens is extended by approximately 5.5 times in the 35mm format.

ENGADGET: Pentax launches Q10 interchangeable lens camera, K-5 II and K-5 IIs flagship DSLRs

Using a lens with too long a focal length, for instance, makes the image appear flat.

ECONOMIST: Animation takes on a whole new reality