Archived posting to the Leica Users Group, 1998/09/21

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Subject: Re: [Leica] Lens wt vs finish->Now question about titanium
From: "Mark Kronquist" <mak@teleport.com>
Date: Mon, 21 Sep 1998 15:25:00 -0700

is the piece Titanium or Titanium FINISHED brass?
- -----Original Message-----
From: Dan Cardish <dcardish@microtec.net>
To: leica-users@mejac.palo-alto.ca.us <leica-users@mejac.palo-alto.ca.us>
Date: Monday, September 21, 1998 3:10 PM
Subject: Re: [Leica] Lens wt vs finish->Now question about titanium

>You make it sound as if titanium is not sutable for camera bodies either!
>Thank you for clarifying the issue.
>
>Dan C.
>
>At 03:26 PM 21-09-98 -0400, Frank wrote:
>>
>>Dan Cardish wrote
>>
>>"I have been told that titanium is no more coslty than steel, and not any
>>more difficult to machine."
>>
>>Sorry Don you have been told wrong.
>> Loads of "high tech" materials are used in consumer goods for marketing
or
>>fashion  reasons only. (They are often used inappropriately by engineers
as
>>well!)
>[snip]
>>Titanium is certainly excellent at corrosion resistance but the 6Al4V
>>normal alloy is not especially strong and all Ti alloys are extremely
notch
>>sensitive and prone to cracking. Also because of its low Youngs modulus
>>Titanium parts are not very stiff. Still its a good material for a very
>>limited number of applications. It is specified far to often for
>>fashionable rather than technically sound reasons!
>>
>>Ti does not make a very good choice for a lens barrel in my view.
>