There're two methods to adjust the focus:
one method is to adjust by the focal gauge.
The other method is to adjust by the aluminum plate.

TIPS: NOT the smaller focal point, the better for engraving photos!
For example, if you need to use a high power laser module to engrave grayscale photos on wood, it would be better to move down the laser module a little more to make the focal point to be bigger, so as to get a better grayscale effect.

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