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十、光线的分配表达透镜速率的F—指数表明了在图像中心聚焦的光总量。偏离光轴的像点不一定接受到同样的进光量。光线分配以图像中心亮度和偏离中心像点的亮度之比给出。有两个原因造成了达到图像边缘的光线少于中心:光晕和cos四次幂定理。边缘光线密集程度是以上两种情况的产物。如果你打开光圈,由透镜中心看进去,进光孔是圆的;但若与光轴成一个角度看进去,进光孔就会呈现椭圆形,这是由于透镜的圆柱形掩蔽了一部分
X. Distribution of Light The F-index expressing the lens velocity shows the total amount of light focused at the center of the image. The point of departure from the optical axis does not necessarily receive the same amount of light. The light distribution is given as the ratio of the brightness of the center of the image to the brightness of the center pixel away from the center. There are two reasons for the light reaching the edges of the image less than the center: the fourth power of the halo and the cos theorem. Edge light intensity is the product of the above two cases. If you open the aperture, look through the center of the lens, into the light hole is round; but if the optical axis into an angle, the light hole will appear oval, which is due to the cylindrical lens masking part