The Pentax Auto 110 is the smallest single lens reflex camera ever made and the only camera with interchangeable lenses ever produced for the 110 film cartridge. A true camera system, the Auto 110 has six available lenses: 18mm, 24mm, 50mm, 70mm, 18mm fixed-focus, and 20-40mm zoom (all f/2.8), two external flashes, an electric film winder, and a slew of macro adapters, filters, diopters, and lens hoods. A third party 1.7x teleconverter was also produced by the German company Soligor.