But only with the right focal distance and correct aperture could we get the true pictures.

只有我们调对了焦距，对准了光圈，才有可能得到真实的图像。

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According to image plane interference status of optical aperture synthesis(OAS) and Huyges Fresnel theory, a mathematical method is set up which fits with the true condition.

从惠更斯—菲涅耳原理出发，根据光学综合成像像面干涉的实际情况，建立了符合实际的光学综合孔径像面干涉数学模型；

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Is it true that there is no direct conversion between the aperture size (diameter) and meshes of silk screen?

丝网孔度(直径)和目之间是否无法直接换算？

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