My 50/1.4 is radioactive and has a SN in the 180k's. It also has fungus in it,
is in pieces, and is one of those held together with JB Weld or something
equally hard to get apart. So, either my lens has had the ring replaced, or
radioactive 1.4's are quite a bit easier to find than M-lenses.
Mark
>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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