Re: [Leica] Leitz and Leica Glass

["Raimo Korhonen" <raimo.korhonen@pp2.inet.fi>]

It was a shock to me too and I, too, checked one knowledgeable source,
Gianni Rogliatti=B4s Leica and Leicaflex Lenses - and guess what I foun=
d:
"glass ... is researched and its characteristics determined byt the Lei=
tz
optical laboratory. It is then produced in quantity by outside supplier=
s"
(page 12). It seems that one=B4s memory is not so good when in an - wel=
l -
advanced age. Raimo

- ----------
> From: Patrick G. Sobalvarro <pgs@sobalvarro.org>
> To: leica-users@mejac.palo-alto.ca.us
> Subject: Re: [Leica] Leitz and Leica Glass
> Date: 01. kes=E4kuuta 1998 20:39
>=20
> Marc James Small wrote:
> > To the best of my knowledge, and per every written source I have at
hand,
> > neither Leitz nor Leica EVER made their own glass.  The Research La=
b
was
> > simply that:  a research lab. =20
>=20
> I guess I have some written sources at hand that you don't:
>=20
> "Several types of glass are necessary in any one lens.  A glass may b=
e
> supplied by one of a few optical-glass manufacturers in the world, or=
 it
> may be a special Leica glass developed and made in their own glass
> laboratory.  Bought-in glass will be accompanied by a certificate tha=
t
> it meets specifications; a batch of Leica's own glass will be analyze=
d
> for chemical purity and tested for correct optical properties."
>=20
> -Dennis Laney, "Leica Lens Practice: Choosing and Using Leica Lenses,=
"
> 2nd Ed., Hove Books, 1993.
>=20
>=20
> and:
>=20
> "Leica lenses are based on high quality optical glasses, some of whic=
h
> are produced in the Leitz Glass Research Laboratory, including the us=
e
> of rare earth glasses."
>=20
> - Guenter Osterloh, "Excellence in Photography: Applied Leica
> Technique," 2nd English-language edition, Umschau Verlag, 1985.=20
>=20
>=20
> I'm pretty sure I have some other references that say this, as well, =
but
> I'm too lazy to dig through them right now.
>=20
> -Patrick