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[OM] From [Gary Reese <pcacala@xxxxxxxxxxxxx>] Re: Yellowing of radio

Subject: [OM] From [Gary Reese <pcacala@xxxxxxxxxxxxx>] Re: Yellowing of radioactive lens elements....Re: [OM] 55/1.2
From: Thomas Heide Clausen <omlist@xxxxxxx>
Date: Mon, 11 Aug 2003 03:46:03 +0200

Begin forwarded message:

Mark M. writes:

<< And to answer another question, the only Zuikos known to be
radioactive
are the silvernose 55/1.2's, with 2 radioactive elements, and the
very early
50/1.4's, with one.  These are also the only known Zuikos to yellow. 
>>

The 1971 era 50mm f/1.4 Zuiko in an M42 mount was radioactive.
Perhaps other
non OM Syem Zuikos were, too.

<< There are silvernose 50/1.4's that are not radioactive though, and
the SN
of the change has not been determined. >>

It may correspond to a serial number gap at 180,000. Thus, serial
numbers
less than 180,000 would be radioactive and quite good performers in
the
center of the field.  It would be a useful exercise to determine if
any over
180,000 have yellowed.

Gary Reese
Las Vegas, NV

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