Ermanox is mostly known for its Ernostar 100/2 and 85/1.8 lenses. Even now, 100/2 lenses are considered as extremely fast, but in 1924 they were revolutionary, allowing previously impossible low light photography without a flash. A couple of years later, Ernemann introduced Ermanox Reflex which is highly sought by collectors and fetching really high prices.
Zeiss Ikon continued production of Ermanox after merger with Ernemann. Later, Ermanox lenses became a base for Contax Sonnar fast lenses line.