?低通滤光器
... 有色玻璃滤光镜 colored-glass filters 低通滤光器, 光学低通滤色器 optical low-pass filter 中性滤光片，消衡滤色器 light balancing filter ...
光学低通滤波器
Then, they move on to clean rooms, where the Dragon sensor and new optical low-pass filter are installed.
ENGADGET: After hours at NAB: A closer look at Red's Dragon upgrade operation (video)
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