The invention provides a method with a concave lens focus as a welding heat source and a welding device thereof.
本发明提供一种以凸透镜焦点为焊接热源的方法及其焊接装置。
A new method of measuring the lens focus is presented, which is based onthe principle of transformation of the Gauss laser beam.
根据透镜对高斯激光束束宽的变换原理，提出了一种由变换前后发散角的变化确定透镜焦距的新方法。
The method to measure the lens focus with laser speckle is described. The principle of this method is analysed and verified by experiment.
本文描述了利用激光散斑测量透镜焦距的方法，并对该方法进行了原理分析和实验验证。
Usually can not do without the accumulation of writing, photography, the same is true, the accumulation in the lens focus to include the accumulation.
写文章离不开平时积累，摄影同样如此，这个积累就包含着眼中镜头的积累。
The Angle spectrum analysis of self-image of double frequency grating is given. The grating duplication and the measurement of lens focus are obtained by Tablot effect of holographic phase grating.
本文给出了双频光栅自成象的角谱分析，并利用位相型的全息双频光栅的太保效应来进行复制光栅和测定透镜焦距等。
It has a lens system to focus light onto the film at the back of the camera.
它的镜片系统可以将光线聚焦到相机后部的胶片上。
If all these approaches are impractical, one could always resort to manual focus using distance markings on the lens.
如果这些方法都不奏效，你还可以利用镜头上的距离标示来手动对焦（以及合适的超焦距）。
The f-stop, otherwise known as the aperture, determines your depth of field (the area in focus) and how much light can pass through the lens to reach the sensor.
f制光圈(或称光圈)决定相机的景深(对焦区域)以及有多少光能通过镜头到达传感器。
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。
Chromatic Aberration — usually associated with objective lenses of refractor telescopes, is the failure of a lens to bring light of different wavelengths (colors) to a common focus.
色差-经常在折射望远镜的物镜上出现，是因为透镜不能把不同波长(颜色)的光聚焦到一点而形成的。
Researchers coordinate the curvature of the lens and the detector in order to create an image that is magnified and in-focus.
研究者通过调节镜头和感光元件的曲率，就能产生可放大和聚焦的图像。
Spherical Aberration — causes light rays passing through a lens (or reflected from a mirror) at different distances from the optical center to come to focus at different points on the axis.
球差-使以不同孔径角穿过透镜(或从镜面上发射)的光线不能聚焦在轴上的同一点。
It has a wide-aperture lens to capture as much light as possible, and the technology requires no clunky auto-focus mechanism. It adjusts exposure time automatically.
它的大光圈镜头可以摄入尽可能大的光量，所用技术并不需要笨重的自动对焦系统，曝光时间也是自动调节。
The main lens is fixed in place; there is no auto-focus, auto-aperture, or other gubbins.
主要镜头是固定的，没有自动对焦和自动光圈以及其他小配件。
All zoom, focus, and lens shift adjustments are manual.
所有的变焦，聚焦和镜头移动调整手册。
This is the distance (usually in mm.) from the lens (or primary mirror) to the point where the telescope is in focus (focal point).
就是从透镜(或者主反射镜)到焦点的距离，通常单位是毫米(mm)。
Depending on your vision, the right kind of lens helps your eye focus light properly and project a clear image onto the retina.
根据你的视力，配合适的透镜能帮助你的眼睛正确聚焦以在视网膜上投射一个清晰的镜像。
First we must find the focus of a lens.
首先我们需要找到透镜的焦点。
"The iPhone has a single-focus lens with no zoom, and this simplicity keeps me devoted to only composition and the perfect photo opp," Mitsui says.
三井说：“iPhone 3gs只有一个不能调焦距的镜头，这让我把注意力完全放在构图和最佳拍摄时机上。”
Focal length: The distance between the centre of a lens and its principal focus.
焦距：镜头中心与其主焦点的距离。
Lens array consists of many array units, which can improve energy distribution uniformity around the focus of main lens.
列阵透镜由多个列阵元拼接而成，用以改善主透镜焦点附近能量分布的均匀性。
When we're engaged in near-focus tasks our eyes are actually working really hard, because the muscles have to accommodate the lens to focus that close.
当我们从事近聚焦任务时，我们的眼睛确实工作得很辛苦，因为肌肉必须适应镜头来聚焦。
If the eyeball is too long, the eye's lens can't focus the light in the right part of the retina to process images clearly.
如果眼球太长，那么眼睛的晶状体就无法将光线聚集在视网膜的正确位置，人类也无法接收到清晰的图像。
Although it is a big "home coming" day for Huahua's, Dashu is the focus of the lens.
虽然今天是花花回家的大日子，今天的镜头是属于大树的！
The projector lens improves the light utilization (make it more focus) and solves the problem of astigmatism.
透镜提升光源使用率（更加聚光），解决散光问题；
There are bad optical aberration in the camera lens of short focus.
短焦距摄像机镜头一般都存在比较严重的光学畸变。
There are bad optical aberration in the camera lens of short focus.
短焦距摄像机镜头一般都存在比较严重的光学畸变。
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