先把F数们都搬出来：
Conventions and Definitions > Working F/#
Conventions and Definitions > Paraxial Working F/#
Conventions and Definitions > Image Space F/#
总结一下，
Working F/#最准，因为它基于实际光线计算。
Paraxial Working F/#也考虑物像位置关系，不过用的是近轴边缘光线的计算。
Image Space F/#是大家比较熟悉的F数的定义，也就是焦距/入瞳尺寸。
还有个
Effective F/#，这里也提一下。
The Analyze Tab (sequential ui mode) > Image Quality Group > Extended Scene Analysis > Relative Illumination
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