The lens system is equipped with an advanced achromatic optical coating that reduces light reflection to 0.3%, enabling very bright and clear images with a wide field of view. Magnification: 5X, working distance: 360-460mm. With filter to reduce light. Magnifiers with large field of view and long depth of field. This will reduce your eye strain and provide comfortable viewing continuously. Choosing the right loupes can enable better posture, help prevent neck and back pain and eye strain, and allow you to perform at your best for accurate and efficient work.