Archived posting to the Leica Users Group, 1999/01/01
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Terry, It occured to me to add that it is a good idea to shine a pen light through older Leica lenses. They sometimes have a cloudy layer on the internal surfaces, apparently related to an animal-based lubricant used in the past. It is hardly visible shen holding the lense up to the light, but is quite evident with the penlight test. It will cause substantial flare and loss of contrast. The lens can be cleaned, but the cost of cleaning needs to be factored into reckoning the lneses' value. Sincerely, Joe Stephenson +++++++++++ Terry wrote: >I've just got a 50mm f2 collapsible Summicron (#1167850) that is in nice >shape except for a bunch of very fine cleaning marks on the front coating. >Will these make a significant difference in its performance? > >Terry