Observant photographers have noticed that not all lenses are created equal: large aperture lenses show strong out-of-focus effects while small-aperture lenses lead simply to a softening of the image.

• 细心的摄影者会发现不是所有的镜头都是一样的：大光圈的镜头呈现强烈的失焦效果，而小光圈的镜头只是稍微的让图像柔化一些。