+3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
Enter your E-mail address. We'll send you an e-mail with instructions to reset your password.
Do not provide any information or data that is restricted by applicable law, including by the People’s Republic of China’s Cybersecurity and Data Security Laws ( e.g., Important Data, National Core Data, etc.).
不要提供任何受适用法律，包括中华人民共和国的网络安全和数据安全法限制的信息或数据（如重要数据、国家核心数据等）。