Archived posting to the Leica Users Group, 1997/12/29
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]At 07:25 PM 12/29/97 -0500, Ed Meyers, who really knows better, wrote: >Anyway, I think that with modern technology and very high >prices, the lens you describe should be bubbleless. Ernst would >roll over, if he knew that his lenses had bubbles in them. Ed Hmm. Speak to some glass chemists. The annealing of quality optical glasses is a problem, as bubbling during the cooling stage is a common occurrence. Zeiss was challenged on this for years and had a flier they would send out in the Prewar days showing that the bubbles made no measurable difference. No, Ernst wouldn't be upset. Nor Carl, nor Otto, nor Joseph, nor Max. The problem is endemic and hard to beat. Modern mixing techniques have reduced the problem but not eliminated it: in the very finest optical glasses, it still occurs. Marc msmall@roanoke.infi.net FAX: +540/343-7315 Cha robh bas fir gun ghras fir!