当用户俯视取景屏，准备拍摄小角度景物，或者自拍时，就可以用到可旋转的电子取景屏了。
It lets you take self portraits, take low-angled pictures while looking at the viewfinder from above, and gives you a lot more flexibility.
液晶屏和取景器会显示信息。
取景器图像对镜头精确对焦是非常重要的，它将影响图像的清晰度。拍摄不同用途的照片常常需要不同的对焦屏。
The viewfinder image is crucial for accurate focusing of the lens, and therefore greatly influences image sharpness. Different photographic applications often require different focusing screens.
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