Hello i have recently bought a laser Its a Samita Laser from turkey i work on granite and i have had a problem when the laser engraves the photos it leaves dark lines as you can se in the photos can someone please help me why does this problem happening

The cause is usually an incorrect focus or dirty optics. To fix this, simply clean the lenses and adjust the focus until the lines disappear.

what settings are you using in LB, the result except the black line seems really detailed and precise !

Thank you