[APML] Re: Japanese astronomical magazine (ammonia hypering)

[Brian larmay <power_windows4789@yahoo.com>]

Wow...hey this is interesting!... and the process
seems quite simple as well, however, i am seeing less
and less of D-19 and anything chemical around here.
At some point, Kodak will not need to make anymore
chemicals.

What other high contrast developing chemicals are out
there?

Brian <<exclusive film user!

--- George Anderson <tillerman1@videotron.ca> wrote:

> Ummm, there is something other than film?
> Seriously, in my continued search for B&W films for
> AP work I have been
> reading through the old AAS Bulletins. I found that
> there were some red
> and infra-red sensitive dyes used in emulsions which
> did not respond to
> hydrogen hypering. But they did respond to ammonia
> hypering.
> I did a web search on ammonia hypering and found a
> recipe which I gave a
> try tonight with some forte-pan 400.
> The results look quite promising since the 1 second
> exposure shows
> substantially more than any of the hypered tests
> that I previously ran.
> The 256 second exposure is also an improvement, but
> still not to the
> extent of being useful. The fogging of the film was
> quite low so I will
> try again sometime in the next week with a longer
> time in the ammonia
> and see how it improves.
> If the forte-pan works out I may re-visit some of
> the Ilford films which
> did not respond to hydrogen hypering.
> Someone has to be moving backwards in technology to
> make up for the guys
> moving forward, it is the only way to maintain the
> balance...
> 
> George Anderson
> Montreal Canada
> 
> Clear skies and good health
> 
> Alan Voetsch wrote:
> > BTW, I'd be interested in having a general idea of
> how many folks still
> > do shoot EXCLUSIVELY with emulsion. Any guesses?
> I'm one.
> > 
> > Alan
> >
> _______________________________________________
> Astro-Photo mailing list
> Astro-Photo@seds.org
> http://seds.org/mailman/listinfo/astro-photo
> 




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