How do I adjust the focus of the Beam Expander?

There is a 7/8 of an inch long threaded coupler that can be screwed in and out for adjustment and then the knurled ring nut is the locking ring to hold it at the adjustment you set it at.


Note that the Beam Expander is used to keep the beam divergence to a minimum so that the dot and beam can be seen for very, very long distances.

It is not a focusing lens and will not narrow the beam all the way down to a tiny dot.

Here's a video demonstration:


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