A mechanical device for selectively inserting an optical lens filter, such as day optical filter and a night optical filter, into an optical path of a camera in accordance with light intensity and/or a signal from a user or timer. The device for switching an optical lens filter may include a series of gears and a filter bracket slidably disposed within a housing, which moves between a first position and a second position in order to selectively insert at least one optical lens filter into the optical path of the camera.