> >B&W filters are the only filters > >made of a special german "Schott" glass and of a different process > >entirely. > > Uhh, Sorry, but you are wrong! > > The well known brand Heliopan also uses Schott glass. > Well, I noticed this morning that even my Philips coffee-pot was made of Schott glass (there is a Schott logo next to the handle). Never tried to use it as a filter, although it should even fit 72mm lenses, I think. ;-) Nicolas.
