The Lens Hood with 127mm Metal Filter Thread for 100mm Lens from Cavision is a small, lightweight rubber hood for lenses with an outer diameter of up to 100mm. It features a 120mm rear lens opening and includes a 120 to 100mm adapter ring. This allows you to thread the adapter ring onto your lens with a 100mm front filter thread and then clamp the lens hood into the adapter for a secure fit. This makes it simple to share the lens hood among multiple lenses with additional separately purchased adapter rings. Additionally, the front of the lens hood has an integrated 127mm thread for accepting filters.