How to Choose the Best Focal Length for Your Laser Lens: 1.5″ to 4.0″ Explained
If you’re using a CO2 laser cutter (like a K40, Thunder, or custom build), the single most important part of your machine is the focusing lens. But when you look at replacement lenses, you’ll see different focal lengths like 1.5″, 2.0″, 2.5″, and 4.0″. Choosing the wrong focal length can lead to charred edges, incomplete […]
