Elements' Optimo Lens Hood - 107mm is the replacement hood required to use filtration for 107mm rounds. The new optical diameter of the hood is 110.5mm which is smaller than the stock hood.
The factory hood must be removed before our filtration hood can be installed. The original hood is mounted to the lens with a high strength thread locking compound. This bond can only broken with heat and a heat gun is the best device for delivery and control of the heat, however care must be taken not to overheat the interior of the lens assembly. Because of this it is recommended to use the same individual or organization that handles your Angenieux approved repairs and service.