bleaching radioactive nikkors

[richardHaw]

https://richardhaw.com/2021/05/30/repair-bleaching-radiated-lenses/

this is how i bleached my 35/1.4N, i think I will call it "Michael Jackson" from now

[Roland Vink]

Oh, that's Bad!

[richardHaw]

it's his best album, i think

looks like nikon doesnt use thorium that much?

[Roland Vink]

I read there are low levels of radioactivity from the AI 200/4 micro and maybe a few others, but not enough to cause any discoloration of the glass.
The Nikkor-N 35/1.4 was the pinnacle of lens development when it was announced - a very fast wide-angle lens, with multicoating, close range correction, and special glass for controlling aberrations. Just a bit too special in this case
When the K version came out they were able to substitute different glass with similar properties and no radioactivity.

[David H. Hartman]

All this work to get rid of what you'd pay $50.00 to $120.00 for a Moose Peterson Warming CPL filter. 

Dave