9X Step Up 37 82mm 9X Step Down 82 37mm Rings Filter Stepping AdapterDescription The ring adapter easily screws onto the front of any lens and convert the thread size of your lens to the thread size of other accessory such as filter hoods flashes and lens converters Made of high quality anodized balck aluminum metal Color Balck Extremely solid and lightweight Specifically designed for your camera for a tight and secure fit No wobbling or cross threading Your camera s lens thread size will be marked somewhere on the lens barrel This number is always preceded by a diameter symbol For example diameter 37 37mm lens thread size This number can also often be found printed on the back side of your lens cap The first number is always the lens thread sie the second number is the filter size of the accessory If the first number is bigger it s a step down ring If the first number is smaller it s a step up 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 large range of types and sizes and unfortunately they don t always fit together correctly Fortunately there is a step up or step down filter for just about any need How step up rings work Step up rings provide a way to fit a larger diameter or accessory onto a smaller lens The step up rings screws onto your lenses threading and provided a largee thread with you can attach other parts i