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

["Jim Ives" <flyboy9990@earthlink.net>]

Hi Kent,
    This may be true but I shoot Tech Pan near the humid shores of Lake
Huron and my dry air purge system beats it every time.  As far as humidy
goes, I shoot from a very poor location without a problem.  Even with TP.
Jim Ives
----- Original Message -----
From: <KGKIRKLEY@aol.com>
To: <astro-photo@seds.org>
Sent: Monday, May 26, 2003 5:00 PM
Subject: Re: [APML] Dry Air Purge Rate for hypered film?


>
> 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
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>

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