When I used to deal in super takumars, I was able to "clear up" yellowed examples by sitting them on a black light for a month or so. UV light does fix them for sure.
-- J.C. O'Connell (mailto:[email protected]) Join the CD PLAYER & DISC Discussions : http://tech.groups.yahoo.com/group/cdplayers/ http://launch.groups.yahoo.com/group/cdsound/ -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Mark C Sent: Saturday, December 03, 2011 11:23 PM To: Pentax-Discuss Mail List Subject: Re: Am I blind or what? A question on lenses... 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. -- 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.
