Santhosh Sivan was always a proxy for an ace camera man. Now he is going to expand himself in the film industry by debutting as  an actor. Santhosh Sivan will donne the role of Raja Ravivarma in Lenin Rajendran's flick that is to be titled as 'Makaramanju. The film will also see the debutting of Karthika , the daughter of veteran actress Radha. Radha had already entered filmdom through Telugu movie 'Josh'. The shooting of the movie will commence next week in Goa.