Archived posting to the Leica Users Group, 2005/09/01
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Depends of the angle you put it in. And of course of the ifferbonisation, well known by most astro-geologists specialised in bichronomy. > From: Jim Hemenway <Jim@hemenway.com> > Reply-To: Leica Users Group <lug@leica-users.org> > Date: Thu, 01 Sep 2005 16:55:49 -0400 > To: Leica Users Group <lug@leica-users.org> > Subject: Re: [Leica] Schneideritis > > :-) > > So, if I put my 210mm, (for my 11x14) out in the sun, will those white > spots finally disappear? Or should I put the lens into the freezer. > > > Philippe Orlent wrote: > >> The typical white spots in some Schneider lenses (commonly known as >> Schneideritis) are pretty harmless to the glass and absolutely not the >> same >> as acid markings from fungus. Just send it for a CLA and the lens will >> return fine. The exact origin of the spots remained a big question until >> recently. It seems that one of the workers of the assembly line of certain >> Schneider lenses just had a severe case of dandruft. This combined with an >> oily substance he put in his hair called brillantine made the hair >> particles >> invisible in the lens during quality control before leaving the factory >> (due >> to refraction of light). It is only after a number of years and after a >> chemical reaction following on temperatures above 45,7? centigrade, that >> these white spots become visible. Visible but harmless. >> At least that's what I've heard. >> >> >> >>> From: David Lee <leirex@sbcglobal.net> >>> Reply-To: Leica Users Group <lug@leica-users.org> >>> Date: Thu, 1 Sep 2005 13:07:16 -0700 (PDT) >>> To: Leica Users Group <lug@leica-users.org> >>> Subject: [Leica] Schneideritis >>> >>> Hello, >>> >>> Can anyone educate me on Schneideritis? What is it and what effect >>> does it >>> have on optical performance? >>> >>> Thanks, >>> David >>> > > > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information >