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.
傳統(tǒng)上,在設(shè)計變焦距鏡頭時都要利用高斯光學求解變焦距的各組元焦距、組間隔。
Zoom lens has increasing applications for its inherent properties.
變焦距鏡頭由于其固有特點而得到越來越廣泛的應用 ,目前 ,連續(xù)變焦的變焦距鏡頭普遍采用機械補償型光學結(jié)構(gòu) ,其中的特定光學透鏡組通過凸輪的驅(qū)動沿光軸連續(xù)移動 ,從而實現(xiàn)連續(xù)變焦 ,其可變組元數(shù)大多為二組或更多。
The design of zoom lens control system based on TMS320LF2407A is introduced in this paper.
文中介紹以DSP芯片TMS320LF2407A為核心的連續(xù)變焦鏡頭控制系統(tǒng)的設(shè)計,主要包括變焦距鏡頭的變焦原理、控制系統(tǒng)硬件電路的構(gòu)成、電機控制電路的設(shè)計以及軟件結(jié)構(gòu)。
This is a long focus lens.
這是個長焦距鏡頭。
long focus lens
長焦距（望遠）鏡頭
autofocus zoom lens
自動聚焦變焦距鏡頭
manual zoom lens
(鏡頭)手控可變焦距透鏡
Don't forget to focus the lens.
別忘了調(diào)節(jié)鏡頭的焦距。
the ratio of the focal length to the diameter of a (camera) lens system.
相機鏡頭直徑焦距比。
auto iris zoom lens
自動光圈變焦距鏡頭
Focal length: The distance between the centre of a lens and its principal focus.
焦距:鏡頭中心與其主焦點的距離。
back focal distance
【光】后焦距﹝指鏡頭與菲林間的距離﹞
Measurement of optical surface and foci of long focal length lens by CGH
計算全息法測量長焦透鏡面形和焦距
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.
廣角鏡頭:覆蓋范圍廣闊的鏡頭.它的焦距長度短于所用菲林格式的對角線長度。
macro teleconverter
增距式微距附加鏡﹝使標準鏡頭變成微距而保留最近封焦距離﹞
A typical lens has a focal length(f)of 625 mm.
常見鏡頭的焦距（f）為625毫米。
inverted telephoto lens =retrofocus Iens
廣角鏡頭之一種(擴大后組焦距的設(shè)計)
retrofocus lens = inverted telephoto lens
廣角鏡頭之一種，擴大后組焦距的設(shè)計
The focal length differs with the thickness of the lens
焦距長底隨透鏡的厚度而變化。
Measurement of Long Focal Length of Lens Utilizing Talbot Effect and Morie Technique;
利用泰伯—莫爾法的透鏡長焦距測量
Study on Phase Retrieval Testing for Long-focus Optics
長焦距鏡面的相位恢復檢測技術(shù)研究