Back focus test card

　　Resolution test card Back focus test card YE0121 for camera lens adjustment and check after the focal length. The test card consists of a 72-fan Siemens star on a white background.

　　Back focus test chart using method

　　Use low-transmit filters and low-level lighting to ensure that the camera does not over-adjust the aperture open position.

　　A) Optical focus: adjusts the focal length of the zoom lens to the maximum focal length.

　　B) Back focal length (lens): Adjust the focal length to the shortest focal length by adjusting the mechanical adjustment of the lens screw, and then alternately optimize a).

　　C) Back focus (camera tube): If the focus is on the maximum and short focal lengths of the different channels, Resolution test car the individual camera tubes must be mechanically adjusted for the optical axis.

　　后焦距测试图卡简介

　　后焦距测试图卡YE0121用于相机镜头的调整和检查后焦距。测试图卡由一个72扇形的西门子之星在白色背景上组成。

　　后焦距测试图卡使用方法

　　使用低透射滤光片和低水平照明以确保相机在光圈打开的位置没有过度调节。

　　a)光学聚焦：调整变焦镜头的焦距到最大焦距。

　　b)后焦距(镜头)：通过调节机械地调节镜头螺丝调整焦距到最短焦距，然后交替优化a)。

　　c)后焦距(摄像管)：如果焦点在不同信道的最大和最短焦距变化，个别的摄像管必须机械的调整光轴。

　　1、选择白色通信道。设置光学聚焦在最大焦距。调节W-通道拾取管的最短焦距和发射焦点达到最佳聚焦。必要时交替优化调节光学聚焦。

　　2、调整红色和蓝色拾取管的不变焦距和最短焦距，直到最佳聚焦的实现。图像对焦(对焦调整)通过后焦距的调整得以在全焦段(放大)和恒定的距离对象。

　　分辨率测试卡后焦距测试图卡的外直径是一个分辨率测试图，这个扇形星的分辨率是50.5线，即0.65MHz(625线)或0.64MHz(525线)。这个扇形星有一个不确定的部分直接是为直径的1%。

　　1, select the white channel. Set the optical focus at the maximum focal length. Adjust the shortest focus and emission focus of the W-channel pick-up tube for optimal focus. Adjust the optical focus alternately when necessary.

　　2, adjust the red and blue pick-up tube without changing the focal length and the shortest focal length until the best focus is achieved. The image focus (focus adjustment) is adjusted by the back focal length to be in full focal lengths (magnified) and constant distance objects.

　　Back focus test The outer diameter of the card is a resolution test chart, the fan-shaped star resolution is 50.5 lines, that is 0.65MHz (625 lines) or 0.64MHz (525 lines). The fan-shaped star has an indefinite part that is directly for 1% of the diameter.