The FWHM is the same for all point-sources in the image (if optical aberrations can be neglected).

如果光学系统引起的像差可以忽略，那么影响各星点的FWHM都将是一样的。

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Enthusiasts still clamor for the film cam, whose poor construction yields mysterious optical aberrations and sometimes doesn't even bother to keep images from seeping across the film's sprocket holes.

爱好者们仍然为电影摄像头而狂热，这种摄像头产生神秘的光学相差，有的时候甚至因为摄像机的中导孔漏光而无法保存图像（？）

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The optical engineer must make tradeoffs in controlling aberrations to achieve the desired result of the design. Here are some aberrations found in different types of telescopes

光学设计工程师必须能够平衡控制各种像差来得到想要的设计结果。

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Offering exceptional optical performance to provide minimal distortion and chromatic aberrations while suppressing ghosting and flare, the advanced lens unit allows for higher shutter speed and captures stunningly clear images.

ENGADGET: Panasonic's Lumix line gets a lot more crowded