Why settle for ordinary when you can experience the extraordinary clarity and precision of the 138mm Brilliant Round Drop-In Diopter +2 Close-Up Lens from Lindsey Optics This high-quality optical element is designed to enhance the magnification of your lens, making it an ideal choice for capturing stunning close-up images of small objects. While it may not be a true macro lens, its lightweight design and compatibility with standard cine matte boxes and filter holders make it a quick and convenient option for both professional cinematographers and photography enthusiasts. The Brilliant Diopters from Lindsey Optics are more than just simple plano convex magnifying lenses. They are meticulously crafted to meet the highest standards of cinematography. They fit seamlessly into cine matte boxes, and with a variety of clamping adapters, our 4.5" Round Diopters can be attached directly to cine lens barrels. These lenses are designed to allow cine lenses to focus closer and on smaller objects than normally possible with the lens alone. They work harmoniously with cine prime lenses and cine zooms. Each of our close-up lenses has a focal length expressed in millimeters, but for convenience, the focal length is expressed in "diopters", which is simply the reciprocal of the focal length in meters. Our Round Drop-In Diopters are available in two standard cine sizes of 4 1/2 Inch Round and 138mm Round, and in five strengths including +1/4, 1/2, +1, +2 and +3