The mirrors have a smooth front and an open honeycomb matrix in back, making them much lighter than other mirrors and less prone to gravitational distortion.
镜片的正面是光滑的，反面是矩阵机构的蜂窝，因此比其他类型的镜片更轻，更不容受引力畸变影响。
No distortion, no degumming, neatly cut at both ends of surface, smooth surface.
无变形，无脱胶，两端面切口整齐，表面平整光滑。
Rectilinear distortion: All three binoculars show a moderate amount of pincushion distortion as it is commonly employed to compensate for the globe effect and to provide a smooth panning of the image.
直线畸变：所有三款镜子表现了中等程度的枕形畸变，作为补偿滚球效应的普通措施，并且能提供平滑的视场盘。
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