flat-top plastic bifocal
平顶塑料双焦点透镜
Having the same focus or foci. Used of a lens.
共焦的有共同焦点的。用于透镜
He focuses the lens of a microscope.
他调整显微镜的透镜以定焦点。
The act or result of causing a lens to deviate from accurate focus.
散焦，去焦使透镜偏离准确的焦点的行为或结果
"A convex lens causes rays to converge on a single point, the focal point."
会聚透镜使光线会聚于一点,即焦点。
Analysis and Measurement of Spot Focusing Lens Antenna Resolution
点聚焦透镜天线分辨率的分析与测量
variable focal length (cylindrical) lens
变焦(距)(圆柱)透镜
He focused his binoculars on the bird.
他把双筒远镜的焦点对准在那只鸟上。
air-spaced doublet
双不胶透镜; 双分离透镜; 双分透镜; 空气隙双合透镜; 分离式双透镜
manual zoom lens
(镜头)手控可变焦距透镜
He focused the sun's ray on a piece of paper with a burning-glass.
他用一面凸透镜把阳光在纸上聚成焦点。
Optical Parameters Of Selfoc Lens Measured by Modified Spot Way
改进的斑点法测量自聚焦透镜光学参数
Research on Open Circuit Voltage of Solar Cell Under the Modulation of Lens Focus Position
透镜焦点位置调制太阳电池开路电压的研究
To cause(a beam or a lens) to deviate from accurate focus.
（使）散焦使（一束光或一个透镜）从准确的焦点上偏散开来
No more need to make some change when photo on the focus without eyepiece since no lens on the way to focus, can use barlow too.
因为没有透镜,直接焦点摄影时,不用改动相机,也可以用增倍镜了.
rear-controlled zoom lens
背面调整变焦距透镜
short focal length (high aperture) lens
短焦距(大孔径)透镜
Propagation Properties of Partially Coherent Flat-topped Beam Passing through Astigmatic Lens;
部分相干平顶光束经过双焦距薄透镜的传输特性研究