you could make cameras out of anything like metal, plastic, wood, etc. but usually the first camera was made out of wood but todays cameras are made out of metal.
Usually some sort of metal, but the specific metal can vary. Many chains are made of steel, which is a mixture of iron and some other element, usually carbon.
Steel is made from Iron, and a small percentage of Carbon (around 0.2 - 2%). Other alloying additions can be used to change various properties of the steel. Chromium can be added, for example, to...