[pure-silver] Re: (slightly OT) little black spots in Zuiko lens
- From: "Gene Johnson" <genej2@xxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Tue, 22 Feb 2005 12:59:43 -0800
One of my old Kodak anastigmats that is particularly sharp has a bunch of
them. Same thing for a huge Bausch and Lomb Telestigmat that came out of
the belly of a b-25 or b-29, I'm told. I think Richard once explained it
being characteristic of certain types of high index glass.
----- Original Message -----
From: "Jim MacKenzie" <jim@xxxxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Tuesday, February 22, 2005 6:42 AM
Subject: [pure-silver] Re: (slightly OT) little black spots in Zuiko lens
>
> ----- Original Message -----
> From: "Koch, Gerald" <gkoch02@xxxxxxxxxx>
> To: <pure-silver@xxxxxxxxxxxxx>
> Sent: Tuesday, February 22, 2005 8:39 AM
> Subject: [pure-silver] Re: (slightly OT) little black spots in Zuiko lens
>
>
> > Years ago, when certain kinds of optical glass was difficult to make,
> > lenses were sold with a small bubble or two in one or more elements.
> > I'm not talking about off brand lenses but lenses from reputable
> > companies.
>
> Not just years ago - this still happens in every lens sold today, although
> the size and number of the bubbles has decreased quite markedly. The
> perfect lens has not yet been made.
>
> Jim
>
>
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