A photographer who turned his studio into a workshop producing forged Vietnamese refugee cards was jailed for 21/2 years yesterday. Ho Chun-hung was not the mastermind behind the operation but it could not have been carried out without his expertise, the District Court heard. Ho, 54, was found guilty of forgery and possessing equipment for making a false instrument. The hearing, before Deputy Judge Richard Day, was told the forged cards were used to help Vietnamese people look for jobs at Chek Lap Kok. Police and Immigration Department officials carried out a joint raid at the defendant's studio in Prince Edward last August. A large quantity of material and equipment, including photographs, cameras, laminates and trimmers, was seized, the court heard. Under caution, Ho admitted helping a Vietnamese man called Sam and his wife make the cards. Sam took genuine cards to Ho who produced about 80 copies.