Curious as to how everyone has their Focal Lenses installed. I have a drawing below showing two different diagrams. The Mfg of my Laser recommends Diagram 2 convex side down. However, I have notice drawings of other Mfg, showing Diagram 1 convex side up.
I have installed the Lens both ways and notice that the Laser cuts better with the Focal Lens installed as shown in Diagram 1. I did have to change the Focal length down to get the better cut.