The Schneider 138 mm +3 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. Diopters are the simplest and least expensive method of close-up photography. 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 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.