Archived posting to the Leica Users Group, 2007/11/10
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Len, Impressive. And I believe you ofcourse. But I don't know if those photos prove your point. Both seem to be taken in different lighting situations so is there much interest in comparing them? Philippe Op 10-nov-07, om 17:21 heeft Leonard Taupier het volgende geschreven: > 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 > > > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information >