Nikkor 35mm / f1.4 n, anyone tried one?

Started Jul 26, 2011 | Discussions thread
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Re: Nikkor 35mm / f1.4 n, anyone tried one?
In reply to win39, Jul 5, 2012

win39 wrote:

At least with Olympus which also used some of that radioactive glass, the lenses changed color, yellowing with age, which may be the real reason its use was discontinued. You may have to introduce a color correction in post.

See the later posts:

Also, while some ignorant of the properties might feel a yellowed lens either has to be retired or WB corrected, it just requires UV to clear the thorium element. The obvious solution is a "black light" but these are made of woods glass and have very very very low amounts of UV given off. Windows are the traditional trick, but with more and more houses having UV batted windows, this trick becomes hard to use. The real solution is to use either tanning lights (very expensive) or reptile "heat lamps" which use both infrared and ultraviolet light, with the intention of emulating the sun. Some provide less infrared and more UV, to emulate different conditions at different parts of the world, so being careful to choose one with higher UV transmission than infrared (which can cause heat) is a good choice.

They were not discontinued due to how they aged when stored over time, but rather because they were radioactive! It's currently illegal to use thorium elements. In fact, I was to purchase a Pentax SMC Takumar 35mm / f2 from a fellow DPR user, but in his country it wasn't permitted to ship the lens because of the minor radioactivity given off by the lens.

It's unfortunate because the qualities of many of these thoriated lenses are nothing shy of amazing.

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