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Re: [OM] Re: I'd love to know how low some of these serial numbers go

Subject: Re: [OM] Re: I'd love to know how low some of these serial numbers go
From: Jim Brokaw <jbrokaw@xxxxxxxxxxx>
Date: Tue, 31 Jul 2001 21:44:26 -0700
on 7/31/01 1:08 PM, Gary Richardson at gary_richardson17@xxxxxxxxxxx wrote:

> Hi,
> 
> If an early lens coating can be radioactive, how about the coatings on your
> om1 / 2 viewfinder?  Or is it just the amber colour ones?
> 
> Gary

I don't think its radioactive in the coating, the radioactive coating is
actually in the glass. Like lead crystal, eg Waterford is ~24 0.000000e+00ad. 
They
actually melt the metal or mineral in with the molten glass batch. I went
and looked at my 55/1.2, but I don't have a geiger counter to check it with.
I always wondered how adding an opaque metal or mineral could result in such
clear glass.
-- 

Jim Brokaw
OM-1's, -2's, -4's, (no -3's yet) and no OM-oney... 


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