圆锥角度直接受到焦距的控制。
iPhone的摄像头有焦距固定。
这是指望远镜的焦距与其孔径的比值。
This is the ratio of the focal length of the telescope to its aperture.
先前的一张焦距短，第二张他用了长焦。
For the first shot he used a shorter focal length and the second shot he used a longer one.
你最好把照相机的焦距调整一下对准那些小船。
给你的镜头设置焦距。
更小感光元件会使得镜头产生更长焦距的效果。
Smaller sensors 'crop' the scene and make a lens appear to have a longer focal length.
John的照片没对准焦距，我看不清他的脸。
This photo of John isn't in focus; I can't see his face clearly.
照相机镜头有两项一般属性：f制光圈和焦距。
Camera lenses have two general attributes: f-stop and focal length.
相同的画面，不同的焦距！
但是，一旦你确定了焦距，其他事情就不值一提了。
But once you have the focal length determined, everything else is a piece of cake.
我已经调好光圈焦距，只要这个按钮就行了。
I've already set the lighting and distance. You can just press this button.
这就是我们两个眼球所测量得到的焦距和视差的绝对值。
Here the focal distance and both eyes parallax are absolute values which was measured by highly efficient sensor in one's eyes.
焦距数字越大(以毫米表示)，放大倍数越高。
The larger the number (measured in millimeters), the higher the magnification.
你这样试验过么？用不同的焦距来获得不同的构图和角度？
Do you experiment with different focal lengths to produce different compositions and perspectives in your shots?
探测器必须随着内焦距因图像放大而改变形状时改变其形状。
The detector must change shape as the in-focus image changes shape with magnification.
转换成手动对焦，确保你的焦距对准画面中视觉感强的地方。
Switch to manual focus and make sure your focus is upon a part of your image that is visually strong.
大型的望远镜虽可以检测到微弱的信号，却只有很小的焦距。
Small telescopes see a lot of sky but can detect only strong signals. Large ones, which can detect weak signals, have a narrow focus.
没变焦距缩放。
或者，你还可以将目镜的焦距除以望远镜的焦比来得到出瞳尺寸。
Or, you can calculate the exit pupil by dividing the focal length of the eyepiece (in mm) by the focal ratio of the telescope.
根据镜头焦距的不同，图像会随之变形并且会影响最终的照片效果。
Depending on the lens' focal length, the image will deform and affect how the image looks in photos.
《十倍焦距》短片发生于在芝加哥公园空中射击的野餐会。
The short film Powers of Ten begins with an aerial shot of a couple picnicking in a Chicago park.
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。
Keep in mind that changing focal length will require refocusing in most zoom lenses.
对于专业人员，则可在后续工作中重新回看照片，对焦距进行细微调整。
Professionals, meanwhile, can revisit photos and tweak the focus during the course of the work.
拉近焦距，酷玩乐队在格拉斯顿堡的金字塔舞台热情四射地表演。
Sneaking up... Coldplay perform on the Pyramid stage at Glastonbury.
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。
The focal length you need depends on your distance from the burst and what you're trying to capture.
无论是微小水滴还是飞溅的水花，确定你的目标焦点，并相应地对准相机焦距。
Make sure you know what you're aiming to focus on, either the droplet or the resulting splash and aim your camera and focus accordingly.
无论是微小水滴还是飞溅的水花，确定你的目标焦点，并相应地对准相机焦距。
Make sure you know what you're aiming to focus on, either the droplet or the resulting splash and aim your camera and focus accordingly.
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