Re: [APML] Re: Japanese astronomical magazine

[George Anderson <tillerman1@videotron.ca>]

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
>
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