1·This value controls the amount of distortion. Negative values correct lens barrel distortion, while positive values correct lens pincushion distortion.
此值控制着畸变的量。负数值校正镜头圆桶状面性畸变，而整数值校正镜头针尖状点性畸变。
2·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。