Zeiss is a big bull in the lens industry, and many prototypes of lens structures come from Zeiss.
Leica is a pioneer in small cameras, all of which are famous for their 135 film model. At present, paraxial machines are also the main ones. Lulai is dominated by the double-reverse in the middle format, and the later period of the film era is very boring. Hasselblad and Freescale are in medium format and large format, and now they are making systems.
Japan is a rising star, making breakthroughs in consumer-grade and portable professional cameras.
In fact, when it comes to cameras, we can't avoid Kodak in the United States, the inventor of 135 film, the inventor of Bayer filter, and digital cameras all over the world, except Fuji and Sigma, including mobile phones. I don't know how to collect the patent fee, and there is nothing to say about the impact.