I am a camera with its shutter open, quite passive, recording, not thinking.

我是一台被动的相机，开着快门只记录不思考。

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I left the shutter open to capture his flashing flight path, freezing minutes of time and action into a single image.

我打开相机快门，捕捉它闪过的飞行路径。拍了几分钟，然后合成了一张图片。

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This is because you halved the amount of light being let through the aperture opening, but let in twice as much light by keeping the shutter open longer.

这是因为前一组你用了一半的光圈，而后一组用了一半的快门时间。

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The cinema systems also don't flicker -- a big complaint about the active lenses, which shutter open and closed very rapidly to try to send a different image to each eye.

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The idea was to pop the D3200 into manual mode, force the shutter to stay open for 30 to 60 seconds while on a tripod, and use the camera to trigger the shutter as to avoid camera shake from mashing the button on the body itself.

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All that reduces induced blur when taking your pictures, and allows the shutter to be open for longer.

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