Pinhole lens , Button lens, screw lens optional.

针孔镜头，纽扣镜头，螺丝镜头可选。

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Clicking on this button will recompute the vignetting factors for each field based upon the current lens data.

点击这个按键将根据当前镜头数据重新计算每个视场的渐晕因子。

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Reset: Clicking this button will reset the lens distortion model to its default state.

复位：点击该按钮将重置镜头畸变模型到默认状态。

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Like Q, Mendez has a collection of gadgets -- among them, a skin mole that carries a piece of espionage equipment called a bullet lens, and a coat on which one button is the lens to a concealed camera.

CNN: Books - Former CIA agent unveils secrets that made him 'Master of Disguise'

We discussed the extremely narrow display bezel, striking RGB notification ring around the home button, recessed camera lens and IR blaster (for the QRemote functionality).

ENGADGET

The L-Fn (Lens Function) button suspends the autofocusing operation temporarily to avoid unintended focusing on obstacles that appear suddenly between the camera and the subject.

ENGADGET: Olympus unveils a cavalcade of point and shoot cameras and a PEN lens at CES