Although credited on screen only as cameraman, Carter Stevens - better known as a director and producer in his own right - claims to have been this film's director of photography. Since the film contains no director of photography credit and since Stevens' credit as cameraman appears quite prominently in the head credits, it seems entirely credible that he was in fact the film's d.p.
Some places list Bella as produced in 1976. Possibly it was released in 1980.