数码相机的最大优势就是在于你能够通过液晶屏马上了解你的成像反馈。
One of the main advantages of digital photography is being able to get instant feedback of an image via your camera's LCD screen.
然而，找到目标区(特别是利用光学仪器)并成像就要靠手柄的特殊透镜和大型的液晶显示屏了。
However, finding the target area (especially with eye optics) and imaging it is easier due to special lenses and large LCD of the handset.
本文介绍一种以液晶空间光调制器作为调制位相信息的衍射元件，获得可变焦长的菲涅耳透镜，以及该元件在光学成像系统中的应用。
A kind of diffraction element modulating phase information by LC space light modulator to get a zoom Fresnel lens, as well as the using of said element to optical imaging system, is introduced.
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