Why magnesium alloy????

Started Apr 19, 2013 | Discussions thread
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Re: Really.
In reply to Robin Casady, Apr 20, 2013

Robin Casady wrote:

sandy b wrote:

Football helmets, motorcycle helmets, car body parts, M16 stock/receiver. None of them have magnesium. Plastics have many advantage over metal. Thermodynamically more stable. Light, strong and they have give. Tooling and material expenses drastically lower.

Carbon fiber would be even better, but that's another subject.

The key is that plastics "have give." This is not what you want in the frame of a camera where precision is measured in microns. Magnesium alloy is used for its greater rigidity. Flexure is a bad thing in a camera body.

Exactly! Another serious problem with plastics is ageing. Properties and dimensions change over time, even faster when exposed to ozone, UV and other environmental influences. Plastics are very reactive. If your intention is to build something that will last for a long time, metal is the way to go. All those plastic lenses built today will be long gone when 40 year old Nikkors and CZ lenses made of metal will still work and have value. Ever heard of a plastic watch being passed on through generations?

Having said that: I like the touch and feel of plastics!

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