Some cameras can effectively control the steering, and the lens focal length!

说明：可有效控制一些摄像机的转向、及镜头的焦距！

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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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Based on that the laser rod is equivalent to gradient index rod (GRIN), a new thermal lens focal length expression was achieved.

把激光棒等效为梯度折射率棒，得到了新的热透镜焦距公式。

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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

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

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

ECONOMIST: Animation takes on a whole new reality