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As demands of microscope users on image quality increase, further progress is impeded because the glass available for lens making just does not have the desired dispersion properties to match improved lens designs.

随着显微镜用户对成像质量提出越来越高的要求，显微镜制造遇到了新的瓶颈-找不到合适的玻璃材料能够满足高性能的显微镜设计。

On the other hand, with a 90 mm lens mounted, the frame area on an M6 is pretty small, making it difficult to see what is there. With the G2, the picture area for the 90 mm lens is magnified, making it much easier to see the subject. This also makes critical focusing more difficult.

在另一方面，当用90mm镜头时，M6的取景区域太小了，很难看清被摄对象；而用G2时，90mm镜头的被摄图像区域被放大了，可以比较容易看清目标，M6在这方面也使得挑剔的对焦非常困难。

On the other hand, with a 90 mm lens mounted, the frame area on an M6 is pretty small, making it difficult to see what is there. With the G2, the picture area for the 90 mm lens is magnified, making it much easier to see the subject. This also makes critical focusing more difficult.

在另一方面，当用90mm镜头时，M6的取景区域太小了，很难看清被摄对象；而用G2时，90mm镜头的被摄图像区域被放大，可以比较容易看清目标，M6在这方面也使得挑剔的对焦非常困难。

Also, the shorter focal lengths are desirable, because most digital SLR cameras have image sensors whose dimensions are considerably smaller than a 35mm negative (usually by a factor of 1.3X to 1.7X), making the lens' angle of view equivalent to that of a longer lens on 35mm cameras.

而且，更短的焦距更是想要的，因为绝大多数数码单反相机的图象传感器的尺寸比35 mm负片小(通常要乘1.3x 到1.7x)，从而使镜头的视角相当于一个在35mm相机上的更长焦距镜头的视角。

Optical transfer function of a specific lens is determined,and a image of the lens is calculated in the screen with separate variable by computer calculation.

如果我们能够得到一个具体光学系统的传递函数，那么就能比较容易的算出光源经过光学系统所成的像。

The check of mutation of video camera lens that offerred a kind to be based on BP nerve network newly calculates a standard, this algorithm chooses pattern plate to match poor cent and histogram 2 times 2 times to differ cent to serve as a feature, those who use nerve network from organization, self-study mutation of camera lens of implementation of ability of be used to detects, detect in order to flash next will raise detected dependability.

提出了一种新的基于BP神经网络的视频镜头突变检测算法，该算法选取模板匹配二次差分和直方图二次差分作为特征，利用神经网络的自组织、自学习能力实现镜头突变检测，然后以闪光检测来提高检测的可靠性。

The focal properties of varifocal Fresnel lens was studied in experimental, experimental results showed that the deformation of surface of LCoS will lead to diffusion of the focal of Fresnel lens, one correction method was mentioned.

然后利用已经制作的LCoS相位空间光调制器，实现了可编程的变焦菲涅尔透镜，通过实验研究了变焦菲涅尔透镜的聚焦特性，发现LCoS器件的表面弯曲会导致聚焦焦点的弥散并设计了校正的方案。

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红外变焦镜头为大多数监视应用提供了适当的视场角。2.9至8.2mm红外变焦镜头以非球面光学为特色，为最佳低光性能提供了高速的F1.0最大光圈。

3Rd, this product is suitable in the bathroom on the glass lens, may achieve in the bathroom the mist steamings, glass lens actually clear as in the beginning effect.

本产品适用于浴室内玻璃镜上，可达到浴室内雾气腾腾，玻璃镜却清晰如初的效果。

At 24 h, Ang1 was expressed mainly in the lens, optic cup, mesencephalon, ventral part of hindbrain, and myotomes in the somites, while zfTie2 was mainly expressed in intersomitic vessels including dorsal aorta and axial veins, and sprouting vessels from the dorsal aorta in the trunk. VEGF was expressed mainly in the lens, optic cup, mesencephalon and myotomes in the somites, while zfFlk1 was mainly expressed in intersomitic vessels including dorsal aorta and axial veins, and sprouting vessels from the dorsal aorta in the trunk.

结果从受精卵胚胎发育第12小时可见血管内皮细胞生长因子和血管发生素1及其相应受体flk1和Tie2的表达；在受精卵胚胎发育的第16小时，血管内皮细胞生长因子和血管发生素1主要在头部和尾部胚芽表达；第24小时在眼球、视窝、中脑、后脑的腹前侧和肌节中表达，Tie2和Flk1主要在肌间背部动脉血管、躯干新生血管芽和轴向静脉中表达。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。