Question about focusable lasers?

[HIMNL9]

Their is a middle point were the beam will begin to go in the opposite direction. Big to little. Then back to big.
With this laser it just goes from small to big. With the smallest not being very small especially at distances.

This usually means that the lens is too near to the expander (the expander is the fixed negative lens that you see in your first pic), not too far.

Or that the front lens (the mobile one) is mounted wrong.

 

[jeffd]

Well rayfoss isnt known for having the best divergence.