1.
F-number: The figures marked on the lens collar to indicate the size of the lens aperture in relation to its focal length.It is the ratio of the aperture diameter to the focal length of the lens.
光圈值:刻划在镜头上用来表示镜头孔径与焦距关系的比值。经过选择的数字成一系列。
2.
a compound camera lens with a relatively high aperture.
带有相对高孔径的照相机复合镜头。
3.
Video Lens Design for CCD Camera of Wide-angle Large Aperture
广角大孔径CCD摄像镜头光学设计
4.
The diameter of the objective of a telescope.
孔径望远镜物镜的直径
5.
condenser aperture
聚光镜孔径;聚光镜孔径;聚光器孔径;聚光器孔
6.
R radial lens distortion
【光】径向镜头变形
7.
ultra-rapid lens
甚大光强[相对]孔径物镜
8.
filled aperture radio telescope
连续孔径射电望远镜
9.
aperture synthesis radiotelescope
综合孔径射电望远镜
10.
object lens of large relative aperture
大相对孔径(摄影)物镜
11.
short focal length (high aperture) lens
短焦距(大孔径)透镜
12.
EFEAL Extended Field Elliptical Aperture Lens
可扩展扫描椭圆孔镜头
13.
the ratio of the focal length to the diameter of a (camera) lens system.
相机镜头直径焦距比。
14.
The amount of light that enters the lens can be controled by the length of time the camera shutter is open for (the exposure), and the width of the aperture (the fstop).
进入镜头光的总量可以由照相机快门打开时间的长短（曝光）和孔径的宽度决定。
15.
Discussion on Revamping of The Large Diameter Piercing Head of 10MN Vertical Piercing Mill
10MN立式穿(扩)孔机大直径扩孔头的改造
16.
filled and unfilled aperture radio telescope
连续和非连续孔径射电望远镜
17.
wagon-box rivet head
扁头形[透镜形]大直径铆钉头
18.
lensless photography = pinhole photography
针孔摄影﹝利用针孔代替镜头的摄影方法﹞