What cameras do international photographers use?

Hehe, it depends on how you define the word "international photographer" ... Masters shoot commercial images, news documentaries, outdoor scenery and sports and so on. So the task determines the choice of equipment.

However, in the digital age, most high-end photographers choose Nikon and Canon's top digital SLR, and only a few people choose Leica (135 Quan Huafu Digital) or Hasselblad (digital medium format) or even large format film machine for special needs. Other brand products, such as Sony, Pentax, Fuji, Olympus and so on. It's ok for amateur photographers and home users, but it's still not as good as Nikon and Canon's top machines in dealing with high-end and even extreme environments.