What is the metallic alloy used in camera cases?
They are manufatured by what process?
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In mass production complex shapes like that are usually cast, then the casting is machined where accuracy and good finish is required. Magnesium is a good candidate for casting and Googling around about cast camera casings it seems many if not most of them use magnesium.
This is the Samsung NX1 which is magnesium. https://en.wikipedia.org/wiki/Magnesium_alloy
Huh. Apparently magnesium is even lighter than aluminum. I did not know that.