All the parameters of the zoom system are achieved with mathematic software,which solves a nonlinear equation group set up with a ray-transmission matrix of the zoom lens,based on the theory of the matrix optics.
传统上,在设计变焦距镜头时都要利用高斯光学求解变焦距的各组元焦距、组间隔。
Zoom lens has increasing applications for its inherent properties.
变焦距镜头由于其固有特点而得到越来越广泛的应用 ,目前 ,连续变焦的变焦距镜头普遍采用机械补偿型光学结构 ,其中的特定光学透镜组通过凸轮的驱动沿光轴连续移动 ,从而实现连续变焦 ,其可变组元数大多为二组或更多。
The design of zoom lens control system based on TMS320LF2407A is introduced in this paper.
文中介绍以DSP芯片TMS320LF2407A为核心的连续变焦镜头控制系统的设计,主要包括变焦距镜头的变焦原理、控制系统硬件电路的构成、电机控制电路的设计以及软件结构。
This is a long focus lens.
这是个长焦距镜头。
long focus lens
长焦距（望远）镜头
autofocus zoom lens
自动聚焦变焦距镜头
manual zoom lens
(镜头)手控可变焦距透镜
Don't forget to focus the lens.
别忘了调节镜头的焦距。
the ratio of the focal length to the diameter of a (camera) lens system.
相机镜头直径焦距比。
auto iris zoom lens
自动光圈变焦距镜头
Focal length: The distance between the centre of a lens and its principal focus.
焦距:镜头中心与其主焦点的距离。
back focal distance
【光】后焦距﹝指镜头与菲林间的距离﹞
Measurement of optical surface and foci of long focal length lens by CGH
计算全息法测量长焦透镜面形和焦距
Wide-angle lens: Lens with wide covering power. It has a focal length which is less than the diagonal of the film format with which it is being used.
广角镜头:覆盖范围广阔的镜头.它的焦距长度短于所用菲林格式的对角线长度。
macro teleconverter
增距式微距附加镜﹝使标准镜头变成微距而保留最近封焦距离﹞
A typical lens has a focal length(f)of 625 mm.
常见镜头的焦距（f）为625毫米。
inverted telephoto lens =retrofocus Iens
广角镜头之一种(扩大后组焦距的设计)
retrofocus lens = inverted telephoto lens
广角镜头之一种，扩大后组焦距的设计
The focal length differs with the thickness of the lens
焦距长底随透镜的厚度而变化。
Measurement of Long Focal Length of Lens Utilizing Talbot Effect and Morie Technique;
利用泰伯—莫尔法的透镜长焦距测量
Study on Phase Retrieval Testing for Long-focus Optics
长焦距镜面的相位恢复检测技术研究