求助索雷博主页中OFN光场数的含义

Loy

在浏览索雷博主页时看到了以下关于OFN的指标（OFN = Optical Field Number），请问有大佬知道这里OFN的8,12,14是什么意思吗？
我也打开了它提供的文档，看着也不像里面的视场数。

youyou

https://www.microscopyu.com/microscopy-basics/field-of-view
Field of View page navigation
The diameter of the field in an optical microscope is expressed by the field-of-view number, or simply the field number, which is the diameter of the view field in millimeters measured at the intermediate image plane.

ayh_52uu

视场数等于物方空间的视场直径(mm)与物镜放大倍率的乘积。  视场数 = 视场直径 × 放大倍率

yuanliyan

我理解应该就是指像方视场大小

flyfy

能用于目镜观察的视场直径