The 5'' focus lens is useful for engraving objects with tall rims, such as bowls and boxes. The longer focal length gives you more working distance between the lens and workpiece, so the rim won't interfere with the travel of your laser. In addition, if you use your laser primarily for cutting, or to cut materials close to your laser's maximum thickness capacity, the longer focal length of the 5'' lens will provide a straighter cut, since it is ''in focus'' for a greater portion of the beam length. The trade-off is that the minimum spot size is slightly larger, so the engraving detail will not be quite as sharp.
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