Prytec focal lens is available in 4 focal lengths; 38.1, 50.8, 63.5 and 101.4mm.
The focal length of a lens is the distance at which the focal point occurs. The focal point is where the laser beam has the highest energy. Lens's that have a smaller focal length are ideal for engraving whilst a lens with a long focal length e.g. 101.4mm are ideal for cutting thicker material
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