查询词典 concave lens

Compared to the germanium, a common material used in infrared field, chalcogenide glasses possess the characteristics of low-cost and the little value of dn/dt. Besides, it is amorphous glass, which is produced the spherical and aspheric lens by using a molding process instead of single-point-diamond turning. Thus the mass manufacture cost of infrared lens will drop obviously, the stability and consistency of product is guaranteed.

相对于红外领域常用的材料单晶锗，硫系玻璃不但具有低成本，折射率随温度变化小的特点，而且，由于它是非晶态材料，可以用精密的模压工艺来代替用于晶体材料的单点金刚石车削工艺，其批量加工的成本得到了大幅的降低，产品的稳定性，一致性也得到了明显的提高。

This is true for every super bright lens: in the viewfinder you see the depth of field of the lens at about f/4 or so.

这适用于每一个超明亮镜头：在取景器中看到的镜头深入实地的约2 / 4左右。

Then the scratches and spots on the field lens would be visible at the eye lens.

此时场镜上的划痕和小点会在接目镜中看见。

To improve the imaging quality of CCD camera and make the lens small in size,compact in structure,the wide field of view optical lens with the standard quadric surface and even aspheric surface was designed.

为提高CCD摄像机的成像质量，同时使镜头结构紧凑、小型化，在大视场光学镜头的设计中，引入标准二次曲面和偶次非球面。

In Bazin believes that the film is an ontological position first, and then is an aesthetic stance, the body is the point where the lens and the depth of field long lens, but also point to formal aesthetic montage.

在巴赞认为，电影首先是一种本体论立场，然后才是一种美学立场，这里的本体就是指向长镜头与景深镜头，而美学亦是指向形式化的蒙太奇。

It is found from the analytical expression that the truncation parameter, which is defined as the ratio between the waist of the Gaussian beam and the radius of the lens, has an important effect on the diffraction field distribution of the lens.

应用这个表达式研究了截断参数（透镜的半径与高斯光束束腰半径的比值）对透镜衍射场分布的影响。

The results show: when the eyes gaze at the 0° field of view, the lens can provide an 1-arcmin resolution. And Turning the eye and focusing on the 14° field of view, the lens can provide an 1.1-arcmin resolution.

MTF的评价结果显示：当眼睛注视0°视场时，系统达到1.1 arc minute的分辨率；当转动眼睛注视＋14°视场时，系统达到1.1 arc minute的分辨率。

Unlike the 28-70, it has a fixed rear lens element so the tendency for the lens to act as a "suction device" is eliminated. In fact, the element is fixed both for focusing and zooming, very neat and clever.

24-70 与 28-70 不同的地方，在於(24-70)有固定的后镜组，变焦跟对焦时都不会变动，不会有如同吸尘器一般的效果，是非常好的设计。

Maintains 1, cleans the lens, with the telescope supplements the lens flannelette, or other soft, clean cloth.

保养 1、擦拭透镜时，用望远镜附带的镜头绒布，或其它柔软、清洁的布。

The origin of this color can be traced down to the negative lens of the objective and the first ocular lens. Both of them are made of SF3R, a special radiation resistant flint glass (here I have to correct my statement made in another review : The origin of the yellow color is, at least in the EDF, a radiation resistant glass).

这黄色的来源能追踪到物镜的负透镜和第一块目镜，这两个都是SF3R做的，一种特殊的能抗辐射的含铅玻璃（这里我纠正另一个评测中的观点：黄色的来源，至少在EDF中，是抗辐射玻璃）。

Carry the Savior by the Russian people of the heavy responsibility, looked for theories fulcrum and spirit to rely on in Marxist philosophy, It s obsessed by Marxism ,which makes to look for the only exit that the mankind relieve, it stands upon I m pantofles the political positio...

肩负着救世主义重任的俄罗斯人，在马克思主义哲学中寻找到了理论支点和精神依托，痴迷地把马克思主义看作寻求人类解放的唯一出路，使其确立了唯我独尊的&国家哲学&的政治地位。

The author at length argues that reconsidering the connotation of the democratization of Chinas higher education has indicative reve

最后总结出高等教育民主化对我国高等教育发展的文化启示。