Defocus of 0.14mm is 1/2 wave or very close. (This is based on a 150mm at F8.As the F ratio gets faster, the defocus to one wave gets smaller.Slower F ratios get longer.是什么意思_Defocus of 0.14mm is 1/2 wave or very close. (This is based on a 150mm at F8.As the F ratio gets faster, the defocus to one wave gets smaller.Slower F ratios get longer.在线翻译_英语_读音_用法_例句