Laser beam focusing - How to make Best laser focus! - Endura ..
As for this 10 watt diode laser you need to make a correction for the focal range to get the best engraving results: 71..1 mm – 13 mm (the difference between the laser height and the Z 0 position) – 0..5 mm (thickness of the material)= 57..6 mm; this is the range between the lens and the surface of the work material..