Vivitar 30.5mm to 37mm Step-Up Ring Adapter Black. With professional manufacturing and exquisite workmanship, this Camera Lens Adapter is made of durable and corrosion-resistant steel construction. Can be mounted to the front of the lens to achieve a different diameter. Share the same lens diameter filter, lens hood, additional lens, and other accessories. Besides making financial sense, this allows you to use your favorite lens across different size UV, ND, CPL, the lens adapter is designed to fit securely to the lens, yet can still be removed easily when not needed. Compatible with all 30.5mm camera lenses & 37mm accessories. Your lens thread size will be printed underneath your lens cap or written somewhere on the lens barrel. Make sure you order the correct size otherwise it will not fit your lens. The first number of an adapter ring is always the lens thread size, the second number is the filter size of the accessory.