短语词组短语focus field size 聚焦范围Focus s size 焦点尺寸focus spot size 聚焦光斑尺寸Effective focus size 有效焦点尺寸ffective focus size 有效焦点尺寸Effective e focus size 有效焦点尺寸Tube focus size 光管聚焦尺寸optical focus size 光学焦点尺寸 返回 focus size