Hi
I am new to lasers and am trying to learn and find the forum full of imfo
I am in the process of buying a laser engraver from China and am down to 3 manufacturers as I see it, it will come down to after sale service

I don’t understand what the lenses do am I right in thinking they can change the thickness of the beam ??

What lenses should I get with the engraver

Thanks in advance for your help