I was working on a customer's paintball marker the other day, and I seem to have come across one that is impossible to get the full design into a field of focus that will burn the anodizing. Is there another type of lens that I can get that will keep the beam coherent for a longer distance? I'm using a cheap chinese 40w CO2 engraver. As you can see from the picture, the top ridges of the milling are rising out of the field of focus and the frame is too low to get a good burn. Any help would be appreciated. Just to clarify, I do not have a motorized table, but a ghetto tray that I put cd cases underneath to position the height. Most of my work so far has remained largely in focus, but this was way out.