It is the ratio of the aperture diameter to the focal length of the lens.

經(jīng)過(guò)選擇的數(shù)字成一系列欧美交性又色又爽又黄。

Based on the propagation law of partially coherent light, the spectral changes of Gaussian Schell-model beams passing through an astigmatic aperture lens are studied.

從部分相干光的傳輸理論出發(fā)免费看哟女网站，研究了高斯-謝爾模型光束通過(guò)光闌像散透鏡傳輸軸上的光譜變化規(guī)律亚洲另类欧美日韩爱V。

Eyepieces are differentiated by their '' field stop '', which is the narrowest aperture that light entering the eyepiece must pass through to reach the field lens of the eyepiece.

目鏡由他們的''視野闌''做區(qū)分午夜性爱av在线，這是進(jìn)入目鏡的光線抵達(dá)場(chǎng)透鏡前所經(jīng)過(guò)的最狹窄孔徑日韩毛片二区。

The merit of the invention are: 1 adopting free curved surface imaging method , three part reflection type Zernike polynomial free curved surface forms short focal distance bigger, relative apertures bigger fields of view angle imaging , rectifying optical aberration much better and its structure is simple; 2 adopting the reflection structure without optical lens, has removed the effect of various chromatic aberration , guarantee the imaging articulation; 3 adopt the design of short focal distance big fields of view angle, focal distance 8 - 15 mm, field of view angles 100 -135 degree, having 120 times multiplications under 250 mm imaging distance, having ultra-thin characteristic property; 4 adopting big relative apertures design ,the relative aperture is 2.0-2.4, having improved the illuminance of flat surface; 5 adopting image space telecentric imaging method , ensures that the image surface irradiance is homogeneous.

本發(fā)明的優(yōu)點(diǎn)是：1采用自由曲面成像方法黄色网址日本最新视频，三片反射式Zernike多項(xiàng)式自由曲面形成短焦距大相對(duì)孔徑大視場(chǎng)角成像，更好地校正像差国产A片地址一，結(jié)構(gòu)簡(jiǎn)單一级黄色视频看看；2采用無(wú)透鏡形式的反射式結(jié)構(gòu)日韩一级黄色片无码，消除了各種色差影響，保證成像清晰度无码视频在线观看网站；3采用短焦距大視場(chǎng)角設(shè)計(jì)黄片高清免费视频，焦距8～15mm，具有100～135度的視場(chǎng)角中国体内精谢免费视频，在250mm成像距離下有120倍的放大倍數(shù)71av视频在线，具有超薄特性；4采用大相對(duì)孔徑設(shè)計(jì)99riav.m3u8，相對(duì)孔徑為2.0～2.4美国大片又乱又伦，提高像平面上的光照度；5采用像方遠(yuǎn)心成像方法欧洲vodafonewifi18√k，保證像面輻照度均勻a欧美专区。

Based on the Fresnel diffraction integral and the complex Gaussian expansion for the hard-edge aperture function, a simple and analytical expression for calculating the diffraction field distribution of an apertured lens is presented.

基于菲涅爾衍射積分和將硬邊孔徑函數(shù)展開(kāi)成有限項(xiàng)復(fù)高斯級(jí)數(shù)方法推導(dǎo)出了計(jì)算透鏡衍射光強(qiáng)分布的解析表達(dá)式。

Fish eye lens is a kind of reversed telephoto lens having big relative aperture, large view angle and long back working length. Its view angle can reach 180 degree or even more so it can image object covering semisphere or larger than semisphere to limited plane.

魚(yú)眼鏡頭是一種具有大相對(duì)孔徑国产,日本,欧美,校花在线视频、大視場(chǎng)角和較長(zhǎng)的后工作距離的反攝遠(yuǎn)鏡頭天堂视频网站在线观看，它的視場(chǎng)角可以達(dá)到甚至超過(guò)180°，因此它能夠?qū)肭蚩沼蛏踔脸肭蚩沼虻奈矬w成象在有限的象平面上久草观看视频。

A new type fiber coupling system is designed,which consists of four parts:large aperture lens,1/4 pitch grin lens,taper fiber and step optical fiber with spherical end surface.

設(shè)計(jì)了一種新型的耦合系統(tǒng)老女人操逼午夜视频，該耦合系統(tǒng)由大口徑聚焦透鏡、1/4節(jié)距自聚焦透鏡国产在精品在线观看、錐形光纖和球端光纖四部分組成免费A级黄毛片在线网站免费。

The all-purpose 2.8- to 12-millimeter IR varifocal lens provides the proper field of view for most surveillance applications. The 2.9- to 8.2-millimeter IR varifocal lens features aspherical optics to provide a fast F1.0 maximum aperture for best low-light performance.

多功能的2.8至12mm紅外變焦鏡頭為大多數(shù)監(jiān)視應(yīng)用提供了適當(dāng)?shù)囊晥?chǎng)角。2.9至8.2mm紅外變焦鏡頭以非球面光學(xué)為特色东南亚无码出在线，為最佳低光性能提供了高速的F1.0最大光圈日本乱码一区二区三区不卡。

The ratio of the focal length of a lens or lens system to the effective diameter of its aperture.

屈光度透鏡或棱鏡折光率的一種量度，等于以米計(jì)算焦距之倒數(shù)

The ratio of the focal length of a lens or lens system to the effective diameter of its aperture.

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