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.
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.
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.
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.
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.
如果你想知道使用时的焦距和距离数据，镜头自带的LCD显示屏可以告诉你。
Need to know the focusing and distance Numbers? Just check the lens' built-in LCD.
正如我们前面所学，更长的镜头焦距虽然放大了图像，但同样增加了镜头抖动。
The reason for this is that as we know, longer focal length lenses magnify the image, but they also magnify the camera shake.
然而只有通过复杂的软件才能让原生光线数据产生价值，从而允许用户切换焦距。
But the wealth of raw light data comes to life only with sophisticated software that lets a viewer switch points of focus.
第一类是指将镜头对准天空，调校好，将焦距打开到“无穷大”，然后打开快门。
In the first case enough to aim the camera at the sky, fix it, set the focus "to infinity" and open the shutter.
随着焦距调节，拍摄重点越发清晰，使美国宇航局分析家都不敢相信自己的眼睛了。
AS adjustments were made and the focus sharpened, NASA analysts couldn't believe their eyes.
第一张焦距约70 mm，在相对近的距离拍摄，背景看起来很远而且很小。
The first shot was taken with a short focal length (around 70mm) and from a relatively close distance and the background looked quite far away and small.
藉由改变气球内的气压，就可以调整气球反射给太阳能电池的光线焦距，还有气球内的凹面镜弧度。
The focus of the light on the solar cell can also be fine-tuned by changing the air pressure within the balloon, and thus the curvature of the mirror.
借由改变气球内的气压，就可以调整气球反射给太阳能电池的光线焦距，还有气球内的凹面镜弧度。
The focus of the light on the solar cell can also be fine-tuned by changing the air pressure within the balloon, and thus the curvature of the mirror.
为了获取一个内焦距放大的图像，研究人员开动液压装置，改变透镜曲率，以协调方式改变检测器。
To achieve an in-focus and magnified image, the researchers actuate the hydraulics to change the curvatures of the lens and detector in a coordinated manner.
为了获取一个内焦距放大的图像，研究人员开动液压装置，改变透镜曲率，以协调方式改变检测器。
To achieve an in-focus and magnified image, the researchers actuate the hydraulics to change the curvatures of the lens and detector in a coordinated manner.
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