That's the lens I'm referring to. The photos it takes have a yellow cast to them, similar to the look of using regular "outdoor" colour film indoors with incandescent lighting. It is very pronounced, and certainly not correct, imho.
I've only had this particular lens for about a year, but I'm given to believe that they were fine when new, and "yellowed" with age. Whether this is due to being "radioactive" from rare earth elements decaying, or from glue or some bonding agent decaying I don't know. I do know (at the risk of repeating a post I made a month or two ago) that someone at YahooGroups Spotmatic had a lens of his tested with a Geiger Counter, and it measured "hot". Not necessarily dangerously hot, but hotter than the average hunk of metal and glass. Whether that's a cause of the yellowing, I don't know, but there you have it. This is not merely a yellow reflection from the multi-coating. regards, frank Marcus wrote: > The lens I referred to is the 50mm f1.4 Super-Takumar > w/49mm front thread. It the yellow color is from > Lanthanum doped glass, than were these lenses clear > when new or yellow. And maybe I'm not understanding > properly, but you say the lens transmits yellow which > is certainly correct, but reflections off the front > elements are very much yellow. > -- "The optimist thinks this is the best of all possible worlds. The pessimist fears it is true." -J. Robert Oppenheimer - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
