Archived posting to the Leica Users Group, 2007/11/10
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Hi Philippe, Both photos were taken in natural window light but I see a slight difference in the color temperature. I can see the lightening of the color quite easily in any light though. It has been overcast here the last couple of days but Tuesday will be a sunny day and I plan on taking some color slide photos then. Len On Nov 10, 2007, at 11:52 AM, Philippe Orlent wrote: > 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 >> > > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information