Set the lens aperture to the aperture value designated by the flash unit according to the ISO setting your camera.
按照您相机上闪光装置ISO设置，设置好镜头的光圈大小。
In the same aperture value, I have found that the sky needs four seconds shutter time, but 40 seconds for the sea level.
在一样的光圈值，我测得天空需要4秒的快门时间，但海面需要40秒。
Put the material in a known test hole on the aperture, and then through a small aperture will load imposed on the fabric, for reads deflection scale pointer value.
将待测材料夹在已知孔径的测试孔上，然后通过较小孔径将一定负荷施加于织物上，于刻度指针上读取挠曲度值。
Put the material in a known test hole on the aperture, and then through a small aperture will load imposed on the fabric, for reads deflection scale pointer value.
将待测材料夹在已知孔径的测试孔上，然后通过较小孔径将一定负荷施加于织物上，于刻度指针上读取挠曲度值。
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