在我心目中，我认为在有着众多高质量的变焦镜头时使用“定焦”镜头是无意义的事情。
In my mind, it was pointless having a "fixed" lens when there were so many good quality zoom lenses around.
在最后质量控制阶段，技师会透过镜头在墙上投射相同式样的光线。
In one of the final stages of quality control, a technician projects a uniform pattern through the lens onto the wall.
虽然这些镜头更贵，但在某些方面它们更加有用，而且能以较好的性价比提供优质的图像质量。
While more expensive, they're even more useful in certain roles and still offer excellent image quality for a good price.
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