An admixture formulation of at least one polycarboxylate dispersant and at least one naphthalene dispersant is provided. A focusing screen is mounted to the rotating member so as to correspond to a luminous flux section of a lens unit. Content presented to a party may be related to another party participating in the call or may be related to a third party. The position of the torch body can be freely adjusted by means of a manual rotational movement, said fixing element being guided in a circumferential groove in said securing element. The pre-determined value may be selected to compensate for process corner variations andor other random variations.