The combination of telephoto capabilities and an f/2.8 aperture throughout the zoom range up to 500mm makes this a great lens for wildlife, sports and for you stargazers, astrophotography.
远摄镜头的性能加上f/2.8的光圈，再加上最长500mm的长焦端，使该镜头适合拍摄野生动物和体育赛事，也是天文爱好者进行天文摄影的绝佳镜头。
Range alignment is crucial in motion compensation of the inverse synthetic aperture radar (ISAR).
距离对准是逆合成孔径雷达(ISAR)运动补偿的关键。
The simple formulae of fast calculating aperture antenna directivity and gain are derived using antenna beamwidths. Applied range of these formulae are analyzed and discussed.
导出了用天线方向图的半功率波束宽度快速计算口径天线方向性系数和增益的简单表达式，分析讨论了这些公式的应用范围。
The parameters of triple Fabry-Perot etalon, namely, free spectral range, spectral width, peak offsets between each etalon, effective aperture and so on are optimized.
优化了三通道法布里-珀罗标准具的自由谱范围、带宽、峰值间隔和有效口径等参数。
To higher the ranging accuracy, first of all, a bigger array aperture is required to effectively estimate the range of target far away.
为了实现目标的全程测距，首先要求接收阵的孔径应较大，以实现对远程目标距离的有效估计。
An algorithm based on null steering techniques is proposed to suppress the range ambiguity of spaceborne synthetic aperture radar.
给出了基于零点指向技术抑制星载合成孔径雷达距离模糊的算法。
Range multi-aperture imaging algorithm is proved by theory that it can widen the swath and obtain high resolution at the same time.
理论上已经证实可实现超宽测绘带的距离向多孔径成像方法在增加测绘带宽的同时又可获得较高的分辨率。
Delivering excellent imaging quality at an accessible price, it's the first zoom for the Alpha range offering a wide F2.8 aperture over its entire zoom range.
提供价位适中优秀的成像质量，这是第变焦的阿尔法提供超过其整个变焦范围内广泛象素光圈范围。
To obtain the greatest flash range possible for far-off subjects, he shoots at or near maximum aperture and at a high light sensitivity, either ISO 400 or more rarely 800.
获得为远方的主题可能的最大的闪光范围，他在最大的孔上或附近和在高的光敏性，ISO 400或者更很少800射击。
The correlation between shutter speed and aperture is shown, with a colour-coded warning that alerts users when the Settings are not in the proper range.
之间的快门速度和光圈显示的相关性，以彩色编码警告提醒用户在设置时，在适当的范围内没有。
The spatial aperture range of aerogel can be controlled by changing the ratio of the carbon aerogel to the tungsten carbide.
改变炭气凝胶与碳化钨的比例，可控制气凝胶的空间孔径范围。
The synthetic aperture imaging algorithm is one of the key of the synthetic aperture radar technique, and the range-doppler algorithm is the most classical and common algorithm.
合成孔径成像算法是合成孔径雷达技术中的关键技术之一，距离多普勒算法是成像算法中最经典最常用的算法。
The present invention has the features of wide processing hole aperture range, easy regulation of processing hole aperture, high processing efficiency, low cost, etc.
本发明具有加工孔径适应范围广、加工孔径尺寸可定量调整，加工效率高、所需成本低等特点。
To evaluate the practicality of range multi-aperture SAR system, this paper gives quantitative errors analysis of this system and presents the corresponding amendment to the imaging algorithm.
为了正确地评定距离向多孔径成像方法的实用性，该文给出了体制中各项误差的定量分析，并对一些误差给出了相应的算法上的修正。
Compared to single-satellite radar, a great power-aperture product with longer detection range can be achieved by distributed space-based radars.
分布式星载雷达突破了单星雷达受功率孔径积的限制，具有更远的探测距离；
The intensity distributing and the contributing range for using the serrated aperture are analyzed based on Fresnel diffraction theory.
应用菲涅耳衍射光强分布理论以及光上光强分布理论对波纹光阑在一定条件下的作用范围进行了分析。
The intensity distributing and the contributing range for using the serrated aperture are analyzed based on Fresnel diffraction theory.
应用菲涅耳衍射光强分布理论以及光上光强分布理论对波纹光阑在一定条件下的作用范围进行了分析。
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