The key point of the zooming optical system design is how to solve the image surface drift problem during the process of zooming.
变焦距光学系统是一种焦距可连续改变而像面位置保持稳定的光学系统。
manual zoom lens
(镜头)手控可变焦距透镜
variable focal length (cylindrical) lens
变焦(距)(圆柱)透镜
rear-controlled zoom lens
背面调整变焦距透镜
The focal length differs with the thickness of the lens
焦距长底随透镜的厚度而变化。
short focal length (high aperture) lens
短焦距(大孔径)透镜
autofocus zoom lens
自动聚焦变焦距镜头
Study on Liquid Lens Technology and Its Application in Micro Zoom Optical System
液体透镜技术及其在微型变焦距系统中的应用
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
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快速变焦距手术显微镜
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
auto iris zoom lens
自动光圈变焦距镜头
zoom stereomicroscope
快速变焦距立体显微镜
Electrically driving and controlling adaptive 128 element×128 element liquid crystal micro-lens array with tunable focal length
电控可变焦128元×128元自适应液晶微透镜阵列
The wearer of such glasses could change the focus by sliding a switch along one arm of the frame.
带这种眼镜的人通过调整一只眼镜腿上的滑动开关可以改变焦距。
(physiology) the automatic adjustment in focal length of the lens of the eye.
（生理学）用眼的透镜来自动调节焦距。
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
The Study of Measuring Convex lens Focal Distance with CCD;
用CCD测量凸透镜焦距实验的研究