Archived posting to the Leica Users Group, 2006/01/19

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Subject: Was RE: [Leica] DSLR choice - now Zeiss-Ikon
From: jwlee01 at (John Lee)
Date: Thu Jan 19 16:45:12 2006
References: <BAY101-F280409C258D1728AC3E134AB1C0@phx.gbl>

The top plate of the Leica R9 is made from magnesium.


On 1/19/06, Bill Marshall <> wrote:
> Some final thoughts on the recent discussion of the uxe of magnesium 
> plating
> on the ZI . . .
> Claims were that magnesium is corrosive, which is true. Recent development
> of magnesium alloys have largely eliminated this problem. Some still don't
> like magnesium. Okay.
> Let's turn the question around. What about brass? Corrosive?
> Well, it's certainly not water proof. Brass is also an alloy - copper &
> zinc. Copper is highly corrosive. It will rust with exposure to even small
> amounts of water within a week. Zinc is also corrosive unless it is
> electroplated. What metal is closest to zinc in chemical composition?
> Magnesium. With proper electroplating, magnesium will be about as resistant
> to corrosion as zinc.
> Bottom line is whether these materials will fare well in their intended
> applications, not in an abstract discussion of metallurgy. For its
> application as external cladding on a camera body, magnesium like brass
> (copper & zinc) will do just fine - unless someone tries to use it as an
> underwater camera. Leica agrees with this point, as evidenced by their use
> of magnesium on the Digilux & their description of it as "robust &
> long-lived."
> Bill
> _______________________________________________
> Leica Users Group.
> See for more information

Replies: Reply from at (Douglas Sharp) (Was RE: [Leica] DSLR choice - now Zeiss-Ikon)
Reply from Frank.Dernie at (Frank Dernie) (Was RE: [Leica] DSLR choice - now Zeiss-Ikon)
In reply to: Message from billgem at (Bill Marshall) (Was RE: [Leica] DSLR choice - now Zeiss-Ikon)