Archived posting to the Leica Users Group, 2012/03/29

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Subject: [Leica] Why don't we see more large-aperture wide-angle lenses?
From: benedenia at gmail.com (Marty Deveney)
Date: Thu, 29 Mar 2012 20:35:24 +1030
References: <CAH1UNJ0=oDpsrcq33FMOOZd8+yRmrLENdMZSgcYe4W8xstxGEw@mail.gmail.com> <CB9958FA.11077%chris@chriscrawfordphoto.com> <CAF8hL-GaRB-D_nMrqwOe0U21zzpKQoLJiozihMrVCdufq_53DQ@mail.gmail.com> <02233B99-3715-449E-A323-5161FF702A7D@btinternet.com>

One of the special glass types used in the Nocti and 75 Summilux had an
annealing time of over a decade.

Really good glass is really expensive.

Marty

On Thu, Mar 29, 2012 at 8:26 PM, Frank Dernie
<Frank.Dernie at btinternet.com>wrote:

> Some glass is very expensive to manufacture. The raw materials are not
> always expensive, though the Flourite and ED type glasses are very
> expensive, with high refractive index glasses they have to be annealed for
> several months in order for the refractive index to be constant through the
> sample.
> This is an expensive process, and one of the reasons this sort of glass is
> not much used.
> FD
>
> On 29 Mar, 2012, at 05:40, Richard Man wrote:
>
> > It's the Glass myth, notably on the "highly refractive indexed" glass
> used
> > in the Noctilux. It's so much more convincing to think that there are
> > secret ingredients that only the elves of Schott laboratory can have
> access
> > to, and that only Leica can purchase.
> >
> > Of course it's the optical design, the advantage of the RF design and the
> > hand assembly tolerance that give Leica lens its magic. The glass itself
> is
> > just a small part that everyone can have access to.
> >
> >
> >
> > On Wed, Mar 28, 2012 at 9:12 PM, Chris Crawford <
> > chris at chriscrawfordphoto.com> wrote:
> >
> >> All glass is cheap. Christ, its just melted sand! Optical glass has
> other
> >> ingredients, but it is still very cheap to manufacture. The cost in
> making
> >> lenses is in the cost of the precision machinery needed to grind the
> glass
> >> to precise curves and the labor needed to assemble them.
> >>
> >> --
> >> Chris Crawford
> >> Fine Art Photography
> >> Fort Wayne, Indiana
> >> 260-437-8990
> >>
> >> http://www.chriscrawfordphoto.com  My portfolio
> >>
> >> http://blog.chriscrawfordphoto.com  My latest work!
> >>
> >> http://www.facebook.com/pages/Christopher-Crawford/48229272798
> >> Become a fan on Facebook
> >>
>
>
> _______________________________________________
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>


In reply to: Message from jayanand at gmail.com (Jayanand Govindaraj) ([Leica] Why don't we see more large-aperture wide-angle lenses?)
Message from chris at chriscrawfordphoto.com (Chris Crawford) ([Leica] Why don't we see more large-aperture wide-angle lenses?)
Message from richard at richardmanphoto.com (Richard Man) ([Leica] Why don't we see more large-aperture wide-angle lenses?)
Message from Frank.Dernie at btinternet.com (Frank Dernie) ([Leica] Why don't we see more large-aperture wide-angle lenses?)