A close-up lens is an accessory, often sold by filter manufacturers like Hoya and Cokin, designed to improve a camera lens's ability to focus on subjects at very short distances. By attaching directly to the front of a standard lens, close-up lenses allow photographers to capture detailed images of small objects, textures, or intricate patterns without the need for a dedicated macro lens. They are widely used in macro photography, product photography, and nature photography, offering an affordable and convenient way to achieve sharp, close-focused shots with enhanced detail.