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This ProLF laser includes a 2.5" lens which is a good combination of cutting up to 1/4" and engraving details down to around 8pt fonts. If you cutting constantly at thicker materials, a longer focus lens will give you straighter cut. A 5" lens is useful when engraving into objects where you need more working distance like engraving bowls or boxes with high sides. In addition, on this machine the doors swing open and in order to reach down to the level of the open doors, you need a 5" lens.