4. Lensmount: The diameter of this lensmount is about 0.24 inch smaller than a standard Four Thirds mount, but allows the same amount of light to hit the sensor. It's manufactured from a block made of sintered stainless-steel powder, ground down to the mount shape. The process balances ease of manufacturing, good looks, and the strength needed to hold a lens. This is not a new material, though-it's been used since the film days.