Manufacturers will need to consider alternative alloys then. The Nikon F2 had a cast aluminium chassis with brass top/bottom plates and this seems to have been how professional cameras were generally designed before the move to cast magnesium alloys. Nobody complained about that and I haven't heard of anyone with the slightest trace of sense say the F1-F3 aren't durable cameras for professional use. Even the EOS-1 had an aluminium frame. Engineering polymers might be the way forward.
I guess it comes down to what trade-offs work for you?
I'm not sure about the equipment differences of producing either for a camera chassis.
Aluminum Die Casting | Magnesium Die Casting |
Cheaper than magnesium | Costlier than aluminum |
Alloys are mainly cast using a cold chamber equipment | Most die casting alloys require hot chamber equipment |
Casting cycles are longer | Has very short casting cycles |
Parts are more stable under stress | Has poor tensile strength and not so stable |
Parts are Heavier than magnesium | Parts are lighter than aluminum |
Cannot achieve thinner wall than magnesium | Can achieve thinner wall than aluminum |
Has excellent corrosion resistance | Has poor corrosion resistance |
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