Beta-apo-4'-carotenal oxygenase involved in the last step of synthesis of neurosporaxanthin, a carboxylic apocarotenoid acting as an essential protective pigment and leading to orange pigmentation. 4'-apo-beta-carotenal + H2O + NAD(+) = 2 H(+) + NADH + neurosporaxanthin Is not regulated by light unlike the genes responsible for the preceding reactions in the carotenoid pathway. Belongs to the aldehyde dehydrogenase family.