点图由正面和背面的两个不同的图表组成。

其中一个有31行的点和其他15行的点。 它们可用于确定失真和色差。

 

The dot chart consists of two different charts on the front side and the back side.

One of them has 31 lines of dots and the other 15 lines of dots. They can be used to determine distortion and chromatic aberration.