calibrated focal length

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。

autofocus zoom lens

自动聚焦变焦距镜头

auto iris zoom lens

自动光圈变焦距镜头

Lifting up her camera, she took out a zoom lens and put it on.

她举起照相机，取出一个变焦距镜头换上。

manual zoom lens

(镜头)手控可变焦距透镜

long focus lens

长焦距（望远）镜头

variable focal length (cylindrical) lens

变焦(距)(圆柱)透镜

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﹞

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。

This is a long focus lens.

这是个长焦距镜头。

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。

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快速变焦距手术显微镜

rear-controlled zoom lens

背面调整变焦距透镜

best image plane of zoom lens

变焦距物镜的最佳像面

image plane displacement of zoom lens

变焦距物镜像面位移

zoom stereomicroscope

快速变焦距立体显微镜

back focal distance

【光】后焦距﹝指镜头与菲林间的距离﹞

It has a built-in zoom lens as well.

它也有内置的变焦镜头。