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WTB radioactive 50/1.4 Re: [OM] Yellowing of SC coatings

Subject: WTB radioactive 50/1.4 Re: [OM] Yellowing of SC coatings
From: "Jeff Keller" <jrk_om@xxxxxxxxxxx>
Date: Thu, 24 Jul 2003 15:47:40 -0700
Does anyone have a radioactive 50mm 1.4 they would like to sell? I
vaguely remember SN should be below 120,000 but may well be wrong.

TIA
-jeff

----- Original Message -----
From: "Carlos J. Santisteban Salinas" <cjss@xxxxxxxxxxxxx>
>
> >I do have an old 1.4/50 serial 145xxx and an old
> >1.8/50 serial 887xxx. Both their coatings are
> >yellow-orange these days.
>
> Well, it's not the colour of the *coatings*, but the colour of the
*glass*
> itself what goes yellow on that older, radiactive lenses. Putting the
lens
> in front of a white surface would show a disctinct yellow cast thru
the
> lens; but on most, non-radiactive lenses, the image thru the lens will
be
> about the same colour than the original surface.
>
> My silvernose 50/1.4 (serial 133xxx!!!) does *not* show this yellow
cast,
> but the coating reflections are indeed yellowish-golden, as many other
old
> lenses do.
>
> Best regards,
>
> ...
>
> Carlos J. Santisteban
>
> <cjss@xxxxxxxxxxxxx>
> <http://cjss.galeon.com>
>
>
>
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>
>

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