Determination of the cardinal points of a compound optical system using secondary imagery method;
二次成像法测定光具组的基点
The question about converging and diverging of optical system;
光具组的会聚与发散问题
The longitudinal conjugated property of ideal optical system;
理想光具组的纵向共轭性质
Starting from the principle of photograph formation by an ideal optical system, this paper derives the formulas of field depth and hyperfocal distance.
本文从理想光具组成像原理出发推导出景深和超焦距的公式， 物理思想明确， 并结合公式绘出了景深与有关参量的直观图， 摄影者容易理解和掌握。
Longitudinal magnification describes the longitudinal conjugated property of ideal optical system,on mathematic form,it is the slope of the imaging curve.
纵向放大率描述理想光具组的纵向共轭性质 ,在数学形式上是物象曲线的斜率 ,从纵向放大率的定义出发 ,结合物像曲线 ,分析了理想光具组的纵向共轭规律 ,并举例说明其实际应用 。