The guide video of adjusting the focus of different laser modules

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.

[dalelayton]

they say a picture is worth a thousand words but a little slower video and a thousand words would have greatly helped. there are more variations out there that you can shake a stick at. who is right. if you don't need a gauge why send one. if you have a fixed focus lens why do you have to adjust the lens. if you go by laser point size then that's all that you need to know. confused as ever.

[pl]

what's the point of the metal gauge if you're going to adjust it based on the dot size on the black acrylic? WTF? pretty confusing.

[travismurray]

Where can I get the focal Guage for a Laser Master 2?

[FHGWoodworking]

What thickness is the perspex focus card used? Cheers