Archived posting to the Leica Users Group, 2006/05/25
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Put your lens somewhere facing the sun with some aluminum foil covering the rear element. The yellowing will disappear in 1 to 5 days depending on the darkness of the yellowing and the brightness of the sun. It doesn't work here in New England in the winter. There's a fellow in Arizona who does them year round for other folks all over the world. Jim lkhermann wrote: > At 11:41 AM 5/25/2006 -0500, you wrote: > >> Since I own a SMC Takumar 50mm f1.4 (Asahi Optical Co.) lens in M42 >> mount, I have been interested in this thread. With a Google search, I >> turned up the reference below, which might be of interest to some of >> you. It is interesting to note that no Leica lenses are listed. >> >> http://www.orau.org/ptp/collection/consumer%20products/cameralens.htm >> >> Jim Nichols >> Tullahoma, TN USA > > > Jim, > Thanks for the information. It is amazing to me that several > members of this list have old pentax lenses. My 50mm f1.4 lens is > really yellow. Joseph Low has one too. I did take my Summicron into > the hospital, to the radiology department where the techs still > remembered me and got out their Geiger counter. My lens is > radioactive, producing .5 milliroentgens per hour. I cannot remember > the formulas to calculate what part of maximal dose this would be, but > if we can believe the experts your references use, it shouldn't be much > of a problem. The threat of cataracts does not bother me, as I have > traded my cataractous lenses for implants which work really well. > Lee > > >