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.
当你继续研究比较昂贵的变焦镜头时，你会发现它们有着恒定的光圈。
As you move onto the more expensive zoom lenses, they maintain a constant aperture.
你不让我在瞄准镜头时用光学变焦，而你也不能边拍照边聚焦。
You won't let me use the optical zoom while I'm shooting video; in fact, you can't refocus while shooting video, either.
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