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Briefly speaking, the further distance the marking object from the FL we choose, the weaker laser we get.
简而言之，标记物体与我们选择的焦距距离越远，我们得到的激光越弱。
SECOND STEP:
What difference on the marking object if we choose different focal length
第二步：如果选择不同的焦距，标记对象会有什么不同
Less than the correct FL
（比正确焦距短）
Correct FL
（正确焦距）
More than correct FL
（比正确焦距长）
After checking the above pictures, we will see: when we use the wrong FL for marking object, then we can not get the
strongest laser power.
查看完上述图片后，我们将看到：当使用错误的焦距标记物体时，我们将无法获得最强的激光功率。
THIRD STEP:
To know how to measure the focal length
