How can I concentrate whilst utilizing the Prowl? The Prowl has 2 focus controls, a diopter and a wheel at the entrance with the product. Use the main target wheel at the entrance to bring the display screen into concentrate and utilize the diopter to help you your eye see https://head-mounted-night-vision50494.canariblogs.com/not-known-facts-about-monocular-with-night-vision-43557462