Dedicated to the RF 100mm f/2.8L Macro IS USM lens, this Tripod Mount Ring and Adapter from Canon provides greater overall stability and balance when working with the lens and shooting atop a tripod or monopod. The ring is secured around the lens and incorporates a foot with a 1/4"-20 mount. Made of a lightweight metal that matches the color of the lens, the mount ring is especially helpful in extreme close-up photography where the slightest vibration will show up in your photo.