The Schneider Optics 138 mm +1 Full Field Diopter Lens shortens the close-focusing distance of normal fixed focal length or zoom lenses. This allows the camera to focus closer to the subject and achieve a larger image size while bringing out the sharpest details in even the tiniest subjects. Have you ever wished that your lens could focus closer than it does? Imagine that you could put a magnifying glass in front of your camera's lens. With Schneider Optics Diopters, you can dive into the world of macrophotography with a minimum of expense and with a maximum of confidence.Shoot your stamps, flowers in your garden, your jewelry collection and many other items. If you're thinking of insuring your collectibles, why not have a means of doing it without having to hire an expensive pro? Close-up lenses not only give you creative freedom to help show you a world up close that you never imagined, but also serve as a functional and valuable tool to safeguard your possessions.