The Foca Marly was the last camera produced by the French company OPL. Introduced in 1965 it was a cheap 4x4 plastic camera with built-in magnesium flash. It is a late attempt to produce a camera yet cheaper than the Focasport third series, but it sold poorly.
- Princelle, Jean Loup. Foca Historica. Mialet, France: Éditions Cyclope, 1997. ISBN 2-910284-38-6.
- Vial, Bernard. Histoire des appareils français. Période 1940–1960. Paris: Maeght Éditeur, 1980, re-impressed in 1991. ISBN 2-86941-156-1.