Opticon L-51x USB Kit-2D Imager, StandL 51X The L 51X is the successor of the L 50X and comes with an even more advanced 2D imager. With auto focus and a speed of 100 fps the engine in the L 51X is truly next gen, but maybe the most important part is not the technology inside but the design on the outside, where the L 51X gives you the option to insert your own logo or design of your choosing. Applications The L 51X is often used in service settings; healthcare for wristband scanning,