Very early 50/1.4 lenses also contain a radioactive element and are yellow.
The early 55/1.2 has two radioactive elements, so appears even yellower.
Dawid, if you're curious, you could probably find a Geiger counter at a
local school and find out if it is radioactive or not.
Mark
On Wed, Oct 1, 2008 at 7:52 AM, Timpe, Jim <Jim.Timpe@xxxxxxxxx> wrote:
>
> First time I've heard of yellowing in anything but the 55/1.2.
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