UV will definitely clear the yellowing on the 35/2 supertak.
Ive done it myself many times using a black light (UV).
Don't know about fungus, doubt that.

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-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of Paul
Stenquist
Sent: Thursday, December 22, 2011 7:29 AM
To: Pentax-Discuss Mail List
Subject: Re: Seek and ye shall find Takumars



On Dec 21, 2011, at 12:32 PM, Charles Robinson wrote:

> On Dec 20, 2011, at 18:52, Paul Stenquist wrote:
> 
>> I don't have a hood, but you may want to hold the lens up to a white 
>> light to see if there's a yellow cast to the elements. The 35/2 Tak 
>> is one of the lenses that may have been built with  the radioactive 
>> elements . If so, it would be subject to yellowing. No problem 
>> shooting digital. It's only a drawback when shooting film. (I have a 
>> yellowed 35/2, hence my knowledge of this.)
> 
> Have you not tried the "subject this lens to UV light for quite some 
> time" cure for this?
> 
> Just needs a bit (ok, some days) of sunlight.  Or so I have read.

I don't use the lens, so I really haven't tried to correct it. I've heard of
the UV light fix for fungus. Don't know if it will cure the yellowing. Paul
> 
> -Charles
> 
> --
> Charles Robinson - [email protected]
> Minneapolis, MN
> http://charles.robinsontwins.org 
> http://www.facebook.com/charles.robinson
> 
> 
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