[Leica] Img: Radioactive lens fix works

[len-1 at comcast.net (Leonard Taupier)]

For those of you interested in the Pentax 50mm yellowing problem,  
Here are photos taken before and after 116 hours exposure to UV light  
to reverse the yellow cast problem due to the radioactive element  
Thorium in one of the lens elements.

Before photo. Lens has brownish, yellow cast.

<http://gallery.leica-users.org/v/LeonardT/Pentax/Takumar_50_2.jpg.html>
<http://tinyurl.com/233emd>

Here is a photo taken after only 116 hours of being exposed to UV  
light. The exposure was to 16 hours of sunlight and 100 hours of UV  
from a blacklight.

<http://gallery.leica-users.org/v/LeonardT/Pentax/ 
Takumar_116hrs.jpg.html>
<http://tinyurl.com/2bx7do>

I did not expect any improvement this quickly if at all. I'll  
probably keep the lens in front of the blacklight for a few days more  
to see if there is any further improvement.

Thanks for your interest.
Len