Involved in the biosynthesis of the major C30 carotenoid 4,4'-diapolycopene-4,4'-dioic acid, which protects B.firmus from peroxidative reactions (PubMed:22738026). Catalyzes the oxidation of 4,4'-diapolycopene-4,4'-dial to yield 4,4'-diapolycopene-4,4'-dioic aci (PubMed:25326460). 2 A + all-trans-4,4'-diapolycopene-4,4'-dial + 2 H2O = 2 AH2 + all-trans-4,4'-diapolycopene-4,4'-dioate + 2 H(+) Carotenoid biosynthesis. Belongs to the aldehyde dehydrogenase family.