If you use your laser primarily for cutting, or to cut materials close to your laser’s maximum thickness capacity, we recommend the 2.5″ lens. When compared to the 2″ lens that comes pre-installed on the H-Series 5th Generation Lasers, a longer focal length lens is “in focus” for a greater portion of the beam length, which allows for straighter edges during cutting. 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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