EXT Lenses Although the standard 2" focal lens that comes with the EXT will work well for most projects, to achieve the optimum laser beam on special types of projects we offer two optional focus lenses.
The 1.5" lens is designed for the highest resolution engraving of very fine detail or extremely small fonts. The incredibly small spot size of .003 to .0065" is recommended when engraving above 600 dots per inch files.
The 4" lens produces a focused beam over a longer vertical distance, which makes it ideal when engraving within a recessed area of a product, such as inside a bowl or plate. The lens is also used for cutting through very thick materials.