Archived posting to the Leica Users Group, 2000/01/24
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Jonathan Borden wrote, in part: >>> >> >> Wouldn't a radioactive element in a lens cause film fog? Seems >> strange that >> it should be purposely built in... >> > Rare earth glasses were supposedly invented by Kodak and some of these were > indeed radioactive. The Aero Ektar is reported to contain measurable levels > of Thorium. > > Jonathan Borden > OK, but this doesn't address my initial question, unless I'm supposed to derive from this that there is no effect on film, since the lens *was* purposely designed with one or more radioactive elements. Or, perhaps, you just make sure that the film doesn't sit in the camera for any length of time. I guess a special-purpose, arial surveillance camera wouldn't have film sitting in it for any length of time between exposures... M. - -- Martin Howard | "Very funny Scotty. Now beam down Interactive Systems Designer | my clothes." email: mvhoward@mac.com | www: http://mvhoward.i.am/ +---------------------------------------