Archived posting to the Leica Users Group, 2000/03/17
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]I think the problem has something to do with the particular design, because if it were caused by atmospheric conditions, the same problem would show up on other lenses -- Leica and none Leica. the damaged examples I have seen have a peculiar mottled appearance to the rear element. It looks like something that would clean off, but in fact it won't clean off. the rear element was a new design which is pressed in. I wonder if too much pressure was applied during the manufacture, if stress fractures could develop years later ?? IF any of the damaged lenses are available, Solms repair wants to take a look at them to find out what is happening. Send them to the head of the repair department, Horst Braun. Stephen Gandy "C. E. Workman Jr." wrote: > This survey is being made to determine if there is any relationship of > "fogged" 90 mm Elmarit lenses to their serial numbers/production dates. > > Here's tentative results of the survey on this lens from LUG subscribers so > far: > > Number of responses: 10 > > Serial ranges: 26572XX - 34522XX > > Number of "Fogged" lenses: 3 > > Serial numbers of "Fogged" lenses: 27276XX, 29676XX, 32014XX > > Conclusion: There ain't none!!!! Not enough numbers yet, and wide > separation between those numbers with the "fog" problem. > > I'll be glad to keep records if more want to submit their serial numbers. > Just a thought, though. If the "fog" problem is caused by deterioration of > some of the cements used in the lens construction, as so many think, then > atmospheric and/or storage could really be the cause. > > OK, let's hear it. > > Chuck