短语词组短語focus field size 聚焦範圍Focus s size 焦點尺寸focus spot size 聚焦光斑尺寸Effective focus size 有傚焦點尺寸ffective focus size 有傚焦點尺寸Effective e focus size 有傚焦點尺寸Tube focus size 光琯聚焦尺寸optical focus size 光學焦點尺寸 返回 focus size