Small SLR camera. The cheapest one will do, and second-hand ones will do. About 200-3000.

The most important thing is a macro lens, preferably a special macro lens of about100 mm. If it's cheap, you can go to the vice factory to buy it. Longteng's sp90mm has a good reputation. You can get it within 3000 mm, and you can enter the original factory around 4,000.