The several dynamic focus systems are analyzed. The transmission formulas of laser through them and the way to define the optical lever ratio and the focus of lens are given.

分析了几种不同的动态聚焦系统的特点，给出了激光束通过该系统的变换公式以及光杠杆比和透镜焦距的确定方法。

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It has a lens system to focus light onto the film at the back of the camera.

它的镜片系统可以将光线聚焦到相机后部的胶片上。

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The f-stop, otherwise known as the aperture, determines your depth of field (the area in focus) and how much light can pass through the lens to reach the sensor.

f制光圈(或称光圈)决定相机的景深(对焦区域)以及有多少光能通过镜头到达传感器。

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This means the rear lens elements are as close as possible to the sensor, reducing the back focus distance of each lens to the minimum possible, thus achieving high resolution from edge to edge.

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

It'd be hugely valuable to have the entire bottom of the screen act as a trigger, so you can focus on what's downrange of the lens instead of how to direct your fingernail to land on the speck-of-a-button that'll trigger the shutter.

ENGADGET: Nikon WU-1a wireless mobile adapter for D3200 review: using Android as a remote trigger / wireless display

Her skin, every follicle and flaw in focus in the ground glass of his lens, had the same sun- and sea-wind weathering, but fainter, of the stones of the Californian desert, and her hips had the convolutions of the naked mountains.

ECONOMIST: Charis Wilson