加工定制是	品牌3nh
货号chart	是否跨境货源否

后焦测试卡ye0220被设计用于
?相机镜头调整
?检查后焦距 
借助低透射滤光片和低水平的照明确保相机不超多打开的孔调制位置。
a）光学聚焦：调整焦距变焦镜头的焦距。
b）后焦距（镜头）：通过调节镜头机械螺丝调整镜头的聚焦距离在***短和a）之间交替优化。
c）后焦距（拾取管）：如果焦点以为信道不同和***小间距之间有所差异，那么要通过个别拾取管的机械调整光轴。 
1、选择白色通道。设置光聚焦在焦距和发散焦点，调整w-通道拾取管直到实现焦距。如果优化需要可用光学焦点调整替代。
2、用不变的光学焦点和焦距***短的红色和蓝色拾取管调节，直到实现聚焦。图像对焦（对焦调整）是通过调整后焦距已得到全焦段（放大的）和恒定的距离对象。
the ye0220 test chart is designed for
?adjustment of camera lenses
?checking back focal distance
with the aid of a low transmission filter and by means of low level lighting make sure that the camera is not over modulated with the aperture in the open position.
a)optical focus: adjust focus of zoom lens at greatest focal length.
b)back focal distance (lens): adjust focus at shortest focal length by regulating lens mechanically with adjustment screw and optimize alternatively with a).
c)back focal distance (pick-up tubes): if focus varies from channel between greatest and shortest focal length, the individual pick-up tubes must be adjusted mechanicallyin the optical axis.
1.select white channel. set optical focus at greatest focal length and divergent focus adjust the pick-up tube in w-channel until optimum focus is achieved. if necessary optimize by alternative with optical focus adjustment.
2.with unchanged optical focus adjustment and shortest focal length the red and blue pick-up tube until optimum focus is achieved. image focus (focus adjustment) is maintained at all focal lengths (zoom-in) and constant distance from object by means of back focal distance adjustment. 

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