The theory of secondary spectrum which exists in long focal-wide bands optical systems is introduced in this paper and the qualifications needed to eliminate are also analyzed.
该系统结构简单、质量轻,可用于小型长焦距望远系统中。
Optical and mechanical design for long focal length and wide-field optical system;
长焦距大视场光学系统的光机结构设计
This dissertation aims at meeting the needs of designing long focal length space camera.
本文主要研究了长焦距三反射式望远物镜的设计。
Hybrid diffractive-refractive design based on binary optical elements and equiva- lent glasses have been introduced to correct secondary spectrum in long focus and large spectral bandwidth tdescope.
通过采用基于二元光学器件的折衍射混合设计以及等效玻璃的方法,设计了长焦距宽波段望远系统,并对其二级光谱进行校正。
long focus lens
长焦距（望远）镜头
This is a long focus lens.
这是个长焦距镜头。
Discussion about Off-Focus Influence on MTF for Long Focus Aerial Camera
长焦距航天遥感相机离焦对传递函数的影响
Study of Automatic Focusing Technique for Long Focus Oblique Real-Time Aerial Camera;
长焦距斜视实时航空相机自动调焦技术的研究
Measurement for the Long Focus Length of Lens by Images of Moire Fringes
利用莫尔条纹的计算机图象测量长焦距透镜焦距
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
Optic Design of Collimator with Large Aperture and Long Focal Length
大口径长焦距平行光管光学系统设计
Supporting Structure Design of Long Focus Space Remote Sensor
长焦距空间遥感器支撑结构设计研究
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
Sturdy of large-diameter,long focal length collimator assemble technical
大口径、长焦距平行光管装调技术研究
The Design of Large Field of View, Long-Focus and All Reflective Space Optical System;
大视场、长焦距、反射式空间光学系统设计
Research on Hybrid Diffractive-Refractive Optical System with Long Focal Length and High Resolution;
长焦距高分辨率折衍射混合光学系统的研究
Optical Design of the Reflective Eccentric-pupil Collimator with Large-aperture and Long Focal Length
大口径长焦距反射式偏瞳平行光管光学设计
The unsteadiness of air becomes prohibitive only if instruments with large focal length are used.
只有在使用长焦距的仪器时，才不允许空气的不稳定。
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
The focal length differs with the thickness of the lens
焦距长底随透镜的厚度而变化。
Having three focal lengths.
三焦距的有三个焦距的
equivalent focal length
当量焦距，等效焦距