Archived posting to the Leica Users Group, 1998/12/11
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Perhaps your library needs updating. I called Hasselblad. They said that cooling bubbles were a fact with very early rare-earth glasses back in the 40's and 50's, but if found in a modern lens should be immediately returned to them for replacement. He said that something describable as a "huge bubble" (in his words, huge would be anything more than 0.5mm in diameter) would not be considered passable for a Hasselblad lens. Just to check, I called both Leica and Nikon service, and they said exactly the same thing: bubbles are a thing of the past and no longer considered acceptible given the performance capabilities and tolerances of the latest lenses. Regards, Nigel On Thu, 10 Dec 1998 20:39:06 -0800 tedgrant@islandnet.com (Ted Grant) writes: >Please read up on high end optical glass manufacturing as in Leica, >Zeiss, >Nikon and others. Bubbles occur in the cooling and under the >circumstance >have no effect at all. Why? Look it up! ___________________________________________________________________ You don't need to buy Internet access to use free Internet e-mail. Get completely free e-mail from Juno at http://www.juno.com/getjuno.html or call Juno at (800) 654-JUNO [654-5866]