[2][3][4][5] Long began his career as a photographer with the RAF, and helped found the stereoscopic souvenir/collectible outfit VistaScreen with the Spring Brothers in 1956.

He produced striptease shorts or "glamour home movies", as they were sometimes known, for the 8 mm market, under the banner of Stag Film Productions.

Long was the cameraman on several British horror movies of the 1960s, including The Blood Beast Terror, Repulsion (uncredited) and The Sorcerers.

In 1963, Harry Clifton (producer) re-financed Long's Circlorama cinema (which used the Circular Kinopanorama process based on the idea of Cinéorama) near Piccadilly Circus in London, requesting that the filmmakers make a film with some hobgoblins in it, but the ensuing film, "Circlorama Cavalcade", instead featured circus lions, Formula 2 cars, ice skaters, trains at Clapham Junction and The Swinging Blue Jeans.

He made the anthology movie Screamtime in 1983 and was due to film a Jo Gannon script entitled Plasmid, about albino mutants living in London’s Underground.