1·Can I control the focal length?
我能控制焦距吗？
2·Set the focal length on your lens.
给你的镜头设置焦距。
3·Empty eyes, can not find the focal length.
空洞的眼眸，找不到焦距所在。
4·The iPhone camera has a fixed focal length.
iPhone的摄像头有焦距固定。
5·That cone Angle is directly controlled by the focal length.
圆锥角度直接受到焦距的控制。
6·Camera lenses have two general attributes: f-stop and focal length.
照相机镜头有两项一般属性：f制光圈和焦距。
7·For me, one of the initial questions is how to set the focal length.
对于我来说，一个首要问题就是怎样设置焦距。
8·Two lenses of focal length 10 cm have a combined focal length of 5 cm.
两个焦距都是10厘米的透镜形成的组合透镜焦距为5厘米。
9·This is the ratio of the focal length of the telescope to its aperture.
这是指望远镜的焦距与其孔径的比值。
10·The focal length of the camera lens plays an important role in photo criteria.
摄影机镜头的焦距在摄影规范中起着重要的作用。
1·Camera lenses have two general attributes: f-stop and focal length.
照相机镜头有两项一般属性：f制光圈和焦距。
2·The focal length you need depends on your distance from the burst and what you're trying to capture.
你所需要的焦距取决于你和被拍摄焰火间的距离，以及你想捕捉到怎样的画面。
3·A good rule of thumb to minimise camera shake is to set the shutter speed at a minimum of one second divided by your focal length.
测算你相机的安全快门速度有一个好的方法，你相机镜头焦距的倒数，就是你避免镜头抖动的快门最小值。
4·But once you have the focal length determined, everything else is a piece of cake.
但是，一旦你确定了焦距，其他事情就不值一提了。
5·Keep in mind that changing focal length will require refocusing in most zoom lenses.
要注意的是，对于大多数变焦镜头来说，焦距改变了，就得重新对焦。