Archived posting to the Leica Users Group, 2004/01/15
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]>Neal, >I have one of these in LTM and it is stunningly good. However, it >exhibits all the attributes of radioactive glass as it is quite yellow, >to the point that you can not shoot color film unless you want a nice >yellow tone. >So, Marc, if you are reading this, did the Russians experiment with >radioactive glass on these lenses? >Don Don, According to some of the things I've read in the past couple of weeks apparently the Russians did experiment with Thorium glass, although I have read that there is any pattern to this. All the lenses that I have thus far the, earliest being from 1960, are clear with no apparent yellowing. I know that Leica used Thorium glass in some of the early Summicrons and have seen a couple that are very yellow, perhaps the Russian use of Thorium glass is around that same period, the mid 1950's. Does anyone else have any experience with yellowing Russian glass? Neal F - -- To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html