I'm pleased that you provided these links, because the site was one of
my old favourites that I lost several OS crashes and a computer ago.
As for the Dia plates, don't get excited. They're a darkroom product
meant for making glass plate transparencies from aerial film negatives
by contact printing, so they're analogous to photographic paper. The
'C' in the name indicates that they're colour plates, and they are
likely to be a proprietory Agfa process so practically impossible to
develop any more. Agfa didn't become compatible with Kodak processes
until late in their history, and this product would have used the
paper chemistry which become Kodak-compatible much later than film
chemistry.
'Dia' only indicates that they're for making diapositives, but from
negatives. Direct positive materials were usually marked 'Dia-Direct'
or 'Autopositive' depending on the brand.
OTOH the glass substrate is a fine, high quality glass with perfectly
parallel surfaces ideal for using in an optical path.
I know this crap because, as a spotty youth, I worked in an aerial mapping lab.
regards, Anthony
"Of what use is lens and light
to those who lack in mind and sight"
(Anon)
2009/8/4 mike wilson <[email protected]>:
> http://www.surplusshed.com/pages/item/m2149c.html
> If I thought these would arrive in one piece, I could be seriously tempted.
> They, apparently, don't realise that the "Dia" designation probably means
> that it is positive film. Agfa used to make a 35mm B&W Dia film that
> produced wonderful pictures.
>
> Then again, once I start looking around here I don't know what to spend my
> money on first.
> http://www.surplusshed.com/pages/item/i1475.html
> http://www.surplusshed.com/pages/category/cameralenses_1.html
>
> --
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