背光的低光条件下。
大部分鱼都可以在低光条件下或在脏水里看见东西，还有一些可以看见中长距离的物体。
Most fish can see in low-light conditions or dirty water, and a few can see objects over moderately long distances.
系统结合了低光或无光条件下的最优单色成像及高环境光条件下的最优彩色着色成像，二者均可获得高质量的影像清晰度。
The system combines optimized mono imaging under low or no light conditions with optimized color rendered imaging during high ambient light conditions, with both achieving high quality focus.
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