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
< This message was delivered via the Olympus Mailing List >
< For questions, mailto:owner-olympus@xxxxxxxxxxxxxxx >
< Web Page: http://Zuiko.sls.bc.ca/swright/olympuslist.html >
|