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Appendix C. Focus Lenses
There are a variety of lenses available for your Muse 3D, each specializing in a different cutting thickness or
level of engraving detail. The lenses are listed by “inches” v which is not an indication of the lenses’ physical
size, but rather the focus distance from the material. See below for the recommended lens for different
needs. You can order new or replacement lenses at https://fslaser.com/laser-accessories/
2.5” Focus Lens
Full Spectrum Laser’s Pro-Series comes standard with a 2.5” lens which is good for cutting up to ¼ of material
and engraving detail to around 8pt fonts with a 90w tube. Other lenses are also available that offer different
levels of precision, depending on the goals of the project.
2” Focus Lens
If you are requiring ner engraving and thinner cutting, such as fonts below 8pts, we recommend the 2”
lens. The 2” lens has a good combination of ne engraving and thin cutting. A short focus lens has a smaller
minimum spot size but spreads out more quickly after reaching the focus making them better for ne detail but
not good for thick cutting. A long focus lens keeps the focus longer allowing for straighter edges but does not
focus down to as small a minimum spot.
1.5” Focus Lens
If you are requiring extra ne engraving such as fonts below 6pts, we recommend the 1.5” lens. This is a short
focus lens has a smaller minimum spot size but spreads out more quickly after reaching the focus making them
better for ne detail but not good for thick cutting.
5” Focus Lens
This optic is appropriate for cutting thick foam. The 5” lens has a large spot size, when focused, which prevents
it from being ideal for cutting wood and acrylic. it is also a good lens for engraving into deep bowls, where you
need more working space.
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