The new AREX400 AF, a fiber laser marker that defines a significant advancement in Industrial Marking applications in such sectors as Automotive, Industrial Electronics, Machine Tools and Home Appliances. The AREX400 AF is equipped with an Adjustable Focus (AF) module to allow dynamic focus distance adjustment through an internal optical Z-shifter. The AF module adds an extra z-axis field, enabling the laser to mark Z surfaces within a specified volume (several f-theta options available) with consistent quality and precision. The AF functionality allows to effortlessly mark multi-tiered components, seamlessly adapt to format changes and easily compensate installation errors and tolerances. The AREX400 AF incorporates a pulsed fiber laser source with power options ranging from 10 W to 100 W, plus a new 20 W MOPA (Master Oscillator Power Amplifier) source with selectable pulse duration for extended applicability to a broad range of plastic and metal target materials.