The f-stop, otherwise known as the aperture, determines your depth of field (the area in focus) and how much light can pass through the lens to reach the sensor.
f制光圈(或称光圈)决定相机的景深(对焦区域)以及有多少光能通过镜头到达传感器。
Ultra Red Light sensor are equipped for user friendly and safety(machine automatically stop when perators hand into the working area).
设有安全装置（人手进入红外线范围以内，机器自动停止）。
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