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Re: [OM] Radioactive glass

Subject: Re: [OM] Radioactive glass
From: Mark Dapoz <md@xxxxxxxxxxxx>
Date: Sun, 27 Jul 2003 13:02:35 -0400 (EDT)
On Fri, 25 Jul 2003, Jeff Keller wrote:

> You don't need to be "concerned" about the radioactive 50/1.4 . 
> They seem to be rarer than M lenses. I've been half heartedly 
> looking for one for about six months and have seen several M 
> lenses and cameras but not a single 50/1.4 with SN below
> 15x,xxx let alone below 13x,xxx or 12x,xxx where there is more
> certainty that it is a BAD lens. Even the 55/1.2 s that I've seen
> have high enough SN that their radioactivity is doubtful.     8^(

All M-SYSTEM 50/1.4's (and 1.2's) will have a radioactive element and
will show yellowing.  I also have a very early 50/1.4 (118xxx) and it
also has a yellowing radioactive element.  The 50/1.4 M-SYSTEM/OM-SYSTEM
conversion took place somewhere around the 115xxx range so if you really
want a radioactive 50/1.4 it would probably be easier to find an M-SYSTEM
version of the lens than an OM-SYSTEM one.
                                -mark


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