The right lens for perfect results
Optimal results during laser engraving or laser cutting are achieved by using different lenses. This works in the same way as for a camera that uses different lenses for close-up and wide angle photographs. The various lenses differ by their respective focal distances. The focal distance is indicated in inches. This is the distance from the lens to the focus. The focus, in turn, is the smallest beam diameter (before and behind the focus, the beam expands again). A small beam diameter means a high energy density (= intensity), i. e. an 'aggressive' beam. A focal distance of 2 inches, for example, means that the maximum intensity is reached when the workpiece surface to be cut or engraved is positioned 2 inches (= 5.08 cm) underneath the lens.

How to choose the right focus lens The decision on what lens to use depends on a number of factors: laser power, type of material, degree of detail and resolution of the graphic (dpi), thickness of the material. The following rule of thumb can be applied: The greater the degree of detail of the graphic, the shorter the focal distance during laser engraving. The thicker the material during laser cutting, the greater the focal distance.