Archived posting to the Leica Users Group, 2002/03/24
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- --- Dennis Painter <dennis@hale-pohaku.com> wrote:
> How much is a tonne of Leica glass?
> <SNIP>
>
> I do believe there is a significant amount of glass
> "consumed" in the
> production of a lens element. Cutting shaping and
> grinding from a blank
> to the final element have to remove material.
- ------------------------------------------------------------
I do not know at the moment whom to credit, but one
method of reducing waste, and reducing the time spent
grinding is to heat a cut blank to plasticity and then
press it to shape between two dies.
============================================================
>
> I don't know how much but if only 25% of the material
> ends up in the
> element our pile is still mighty big.
- ------------------------------------------------------------
With the cost of optical glass production,the yield is
probalby much, much higher.
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