Re: [APML] Dry Air Purge Rate for hypered film?

[KGKIRKLEY@aol.com]

In a message dated 5/26/03 3:53:12 PM, banburys@sonic.net writes:

>I'm gearing up to use a dry air purge for hypered film, and was
>wondering how many cubic feet per minute (or fractions thereof) people
>use?
>
>My aquarium tank bubbler is outputting about 0.04 cfm--which doesn't
>seem like much, but I recognize the idea is just to maintain a positive
>pressure against the moist outside air.
>
>Steve

Steve:
This sort of depends on the volume inside the camera, but in general, just 
enough to keep a positive pressure in the camera, so any moisture is flushed out 
and kept out.

Not to rain on your parade, but hypred film is best kept from moisture and 
humidity AND oxygen. A dry air purge will take care of the moisture/humidity 
problem, but not the oxygen one. Only an inert atmosphere like dry nitrogen will 
do that.

Kent Kirkley
_______________________________________________
Astro-Photo mailing list
Astro-Photo@seds.org
http://seds.org/mailman/listinfo/astro-photo