诺基亚N73的光圈2.8，焦距是5.6，快门速度可由0.001秒至2秒，由于配备了与数码相机同等级的机械快门（Mechanical Shutter），可让画面一次曝光后就立即取景。
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... lens definition：镜头清晰度 mechanical shutter：快门 film counter：胶卷计数器 ...
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Nikon mechanical shutter release 尼康机械快门线
The LIVE MOS sensor also allows high speed burst shooting at 5 frames per second in full resolution using a mechanical shutter.
ENGADGET: Panasonic's $900 Lumix GH2 officially debuts: 16MP, 1080p movie mode, 3D interchangeable lens
Here, the 808 PureView delivers again with an autofocus prime lens made by Carl Zeiss that features five aspherical glass elements (in one group) and a mechanical shutter.
ENGADGET: Nokia 808 PureView review: the future of mobile imaging, wrapped in the smartphone past
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