RE: [Leica] impurities in lens

["B. D. Colen" <bdcolen@earthlink.net>]

I'm sure some optical expert will set me straight if I'm wrong, but I'd be
willing to be that the bubbles, within "normal" size and quantity, neither
harm nor "help" a lens. I think people's saying that they improve quality is
just their way of saying that they don't harm the lens, so don't worry about
them.

B.D.

> -----Original Message-----
> From: owner-leica-users@mejac.palo-alto.ca.us
> [mailto:owner-leica-users@mejac.palo-alto.ca.us]On Behalf Of Chris Lee
> Sent: Thursday, June 29, 2000 4:05 PM
> To: leica-users@mejac.palo-alto.ca.us
> Subject: Re: [Leica] impurities in lens
>
>
> Thanks. I checked my other lenses, and I have found the same stuff in most
> of them. However, it looks like there are fewer of these things
> in my medium
> format lenses.
>
> How can a bubble in a lens improve image quality?
>
> Regards,
>
> Chris Lee
>
> > Chris Lee wrote:
> >>
> >> I went to a local Leica dealer today where I was looking at
> many of their
> >> lenses. I noticed almost all of the lenses, which were
> supposed to be brand
> >> new, showed some very tiny "impurities" in the glass. These
> looked like very
> >> fine particles suspended inside the glass elements. Although
> they were only
> >> visible at certain angles in very strong lighting, I couldn't help but
> >> wonder what they were. Can someone tell me if these lenses are
> defective? Or
> >> these things are supposed to exist in every lens, good or bad?<<<<<<<<
> >
> > Hi Chris,
> > Don't be a nervous nellie about little "impurities," simply because if
> > you hold any lens at the right angle to the light you'll find what you
> > think are "impurities."  They're not and at one time the "real old time
> > photographers" looked for "bubbles" in the glass of a lens, as that was
> > a mark of a better lens.
> >
> > ted
>
>