I choose and align two different lenses in order to extend my initial beam : - 1 inch ; f=25.4mm . - 2 inches ; f=750mm.
I've installed my two supports, made using a 3D printer, for the LCD (from the screen of a monitor).
The beam of the setup is too low to path throw the LCD screen. So I added to more mirrors (2 inches) to get the beam higher, and I started to align them.