很多时候被误解为对焦快的镜头-_-我个人喜欢佳能50毫米定焦1.4光圈或者1.8光圈镜头。尼康也有相同型号标准高速镜头可以在室内或低光条件拍摄时，提供高品质的图像。
I like the Canon 50mm 1.4 or 1.8 (I'm sure there is a comparable Nikon) a faster standard lens will allow you to take great food shots when you are indoors or when less light is available.
四月，德国埃费尔斯·贝格的百米射电望远镜由光纤与处于英国焦德雷尔·班克、意大利梅迪奇纳、瑞典奥萨拉以及波兰托伦等观测站的射电望远镜连接起来。
In April, the 100-meter radio telescope Effelsberg in Germany was tied in via fiber optics to radio telescopes at Jodrell Bank in the U.K., Medicina in Italy, Onsala in Sweden and Torun in Poland.
比如，尼康售价399.95美元的P500可以变焦36倍——相当于在35毫米相机上装一个800毫米的长焦镜头——还能够轻而易举地放入手提包里。
For example, Nikon's $399.95 P500 offers a 36x zoom -- the equivalent of an 810 mm telephoto on a 35 mm camera -- but easily fits in a laptop bag.
利用数值计算详细分析和说明了偶数模厄米高斯光束的轴上光强分布和焦移。
The axial intensity distribution and focal shift of H-G beams with even mode Numbers are analyzed and illustrated with detailed numerical examples.
苗床整平后，用铁锹拍平，浇上10%腐熟稀人粪尿，再住床面亡铺一层过筛的焦泥灰或黄泥土，厚度约5厘米即可。
Seedbed leveling, Yongtieqiao shoot-ping, doused with 10% who maturity dilute waste, then living death bed screening of a shop Coke Nihui or yellow soil to a thickness of about 5 cm can be.
改进了1米处的重点在长焦微距模式。
根据1980—1985年的观测资料，本文统计了一米望远镜卡焦照相测光时焦距随温度变化的规律。
According to the observation data obtained during 1980-1985, the author concluded an empirical relationship between the temperature and the changes of the Cassegrain focus of the 1 meter telescope.
叙述了2.16米天文望远镜卡焦及折轴光学系统的调整原理与具体步骤。
In this paper, the principle and procedure of alignment of Cassegrain and coude optical systems for 2.16m astronomical telescope are described.
叙述了2.16米天文望远镜卡焦及折轴光学系统的调整原理与具体步骤。
In this paper, the principle and procedure of alignment of Cassegrain and coude optical systems for 2.16m astronomical telescope are described.
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