Re: [APML] More bad film news

[Wei-Hao Wang <whwang@gmail.com>]

Tony's message reminded me another good-old-day film, Konica Minicopy HR2.
This film also has microfine grains and was widely used in Japan for
solar H-alpha
imaging.  I don't remember I saw any deep sky work done by this film.  Perhaps 
it doesn't hyper well.

Wei-Hao


On Wed, 1 Sep 2004 04:55:42 -0400, Tony Pilato <apilato@stny.rr.com> wrote:
> 
>  Good morning
> 
> George just reminded me of something from the 1980's... Tech Pan's grain is
> a very narrow distribution of cubic grains ~ .5 um in size which can produce
> a very high contrast image. This is very different than the "T grains" (flat
> triangular grains) available in today's B&W and colored films. Many years
> ago I had worked at a microfilm manufacturing plant and did some competitive
> testing. Tech Pan is (used to be!) a microfilm type emulsion with extended
> red sensitivity. Extended red sensitivity used to be important in microfilm
> to sense a red LED in a bank check imaging machine produced by IBM.
> 
> Maybe a microfilm emulsion with extended red sensitivity is worth looking
> at.
> Just my 2 cents, and thanks to all that have looked at films/will look at
> films, and hopefully find something close to Tech Pan.
> 
> Tony Pilato
> Dark Star Images
> www.darkstarimages.com
> apilato@stny.rr.com
> Kopernik Observatory
> www.kopernik.org
> Vestal NY
> 42:00:09   76:03:12
> 1,720 ft.
> 
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-- 
________________________________________________________________
Wei-Hao Wang  :)

Institute for Astronomy at University of Hawaii

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