On Saturday, December 03, 2011 11:26 PM, "David Parsons" <[email protected]> wrote: > One tip that I've read is to put the lens in a window for a few days > (with the lens cap off), and it'll clear up for a while.
Yes it works. I have a SMC Tak 50 1.4 that was badly yellow. The recommended procedure is to wrap it in aluminium foil (leaving the front element exposed) and put the lens in direct sunlight. I put mine under a clear glass jar out in the open and the yellowing cleared in about 2 weeks. The aluminium foil is supposed to reflect sunlight around inside the lens. Cheers Brian ++++++++++++++++++++++++++++++++++ Brian Walters Western Sydney Australia http://lyons-ryan.org/southernlight/ > > On Sat, Dec 3, 2011 at 11:22 PM, Mark C <[email protected]> wrote: > > On 12/3/2011 4:20 PM, Bulent Celasun wrote: > >> > >> The only thing I can see repeatably (!) is the difference in rendering > >> of colors; my radioactive Takumar shows everything a bit yellowish. > > > > IIRC, yellowing with age is a known issue with some radioactive Takumar > > lenses and an be reversed through exposure to UV light (even direct > > sunlight.) I have a dim recollection of someone on this list describing how > > he fixed up on of his old lenses with UV light exposure. > > > > Never thought about this but I wonder if any of the old 6x7 Takumar lenses > > were subject to this. I don't know if they incorporated the radioactive > > elements or not... > > > > Mark C. > > > > > > -- > > PDML Pentax-Discuss Mail List > > [email protected] > > http://pdml.net/mailman/listinfo/pdml_pdml.net > > to UNSUBSCRIBE from the PDML, please visit the link directly above and > > follow the directions. > > > > -- > David Parsons Photography > http://www.davidparsonsphoto.com > > Aloha Photographer Photoblog > http://alohaphotog.blogspot.com/ > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and > follow the directions. > -- -- http://www.fastmail.fm - The professional email service -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
