What is a step-up ring? Step-up rings, also known as adapter rings, allow you to use filters and accessories that are not the same size as your camera lens. Lenses and filters come in a variety of sizes and unfortunately, they are not necessarily fitted correctly. Fortunately, there is a step-up or step-down filter for almost every need. How does the step-up ring work? Step-up ring provides a way to attach larger diameter filters or accessories to smaller lenses. Step-up ring tightens the screw to the lens Create a thread and provide a larger thread that allows you to attach other elements including more step up rings. It is important to note that the more you leave the filter away from the lens, the worsened optics will be. Its always best to find these are the thinnest adapter rings you can find by keeping the filter near the lens. Product Included: 1 x Lens Adapter Ring 67-82mm