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施耐德BMXERT1604T
BMXERT1604T
还有一种调焦方法,即是调理镜头中的某一组透镜,使它想杜宇其他透镜前后移动,也能股动像面平移,终使像面与感光面重合,到达成像明晰。这种调焦方法,改动了镜头的光学构造,镜头焦距有所改动(通常不大)。
例如,前面的透镜组对无穷远的方针成像在Image面上(也是CCD感光面方位),后作业间隔L’,如今要对近处方针成像,像面方位在Image‘,为了成像明晰需求调焦。
一种办法即是整个透镜组一同相对CCD往前移动,使后作业间隔扩大到L“,CCD感光面与像面重合,成像明晰。这种办法即是整组移动式调焦。
还有一种调焦办法:只移动透镜组中的某一(或几个一同)单透镜,也能到达调焦的意图,如下图所示。将第四透镜从方位A向前移动到A‘,对近间隔的方针来说,成像面也回到与CCD重合的方位,使成像明晰。这种调焦方法就称为单组移动式调焦。
BMXERT1604T
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