Archived posting to the Leica Users Group, 1997/12/19
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Eric Welch wrote: >At 08:28 PM 12/18/97 -0800, you wrote: > >>refocused with varying temperatures. I now have 180, 300 and 400mm Nikkors >>with ED glass in them (actually, I believe the 400 may have a flourite >>element, but I haven't been able to confirm this) that all exhibit this >>behaviour, but to a lesser degree. > >Chuck Westfall told me that only Canon uses fluorite elements, because they >have a patented technique for artificially growing fluorite crystals. The >only way to make affordable crystals big enough to make elements. I think you might point out to Chuck next time that among others, Konica produced a 300 mm lens in the 70's that had a flourite element. Like I said, the info on the 400 Nikkor is contradictory (this is the first 400/5.6, before they called any lens 'ED' and started to use the gold band) but the Konica lens is well known. I had one for a number of years, and it was superb. * Henning J. Wulff /|\ Wulff Photography & Design /###\ mailto:henningw@archiphoto.com |[ ]| http://www.archiphoto.com