I'm considering to buy and use laser as described in title mainly for cut materials and mostly for low - power vector engraving on wood/veneers.
Somebody mention on one from Internet forums about replacing 1.5 ich focal length optics to longer one - 4 inches for better cutting materials. I can imagine how beam is focused (physics), but how it performs in practice?
Can anyone point samples of same laser work before/after such change?