Re: [APML] Provia F400......push?

["westergren" <westergren@netzero.net>]

Steve,

I don't think the vacuum can hurt the film at all.  I haven't left film in a
vacuum very long before hypering, I'm usually in a hurry to get it going.  I
have tried RG200 in heated vacuum for 12 hours followed by a couple days in
the vacuum, without hypering, with no change to the film (I reported this a
day or two ago).

OTOH, I often left film in the hyper chamber, under hand pump vacuum, for
days or a week before an observing session.  This was suggested in the
Lumicon directions as a way to keep the hypered film fresh.  Then I did my
testing and found that for PJ400 and PPF400, storing hypered film a couple
months in the freezer improved the performance.  I have RG200 hypered in the
freezer to check this, but its not ready to expose yet.

Don

----- Original Message -----
From: "steve banbury" <banburys@sonic.net>
To: <astro-photo@seds.org>
Sent: Wednesday, October 02, 2002 11:42 PM
Subject: Re: [APML] Provia F400......push?


> Say Don--Is there any disadvantage or harm in letting RG200 (or other
films for
> that matter) sit for a day or two in vacuum before starting hypering?
>
> Steve
>
> westergren wrote:
>
> > Bobby and Jeff,
> >
> > I tested both 35mm and 120 roll Provia400, each with +2 developing.  The
> > color balance doesn't appear to change with push+2.  The light
sensitivity
> > does increase significantly, especially for exposures of an hour or
more.
> > The 120 roll film was slightly less sensitive on long exposures than the
> > 35mm.
> >
> > See the data at
http://home.nethere.net/mpd/FilmTestData/FujiProvia400.htm
> >
> > Don
> >
> > ----- Original Message -----
> > From: "Jeff Ball" <jeffball@zoominternet.net>
> > To: <astro-photo@seds.org>
> > Sent: Wednesday, October 02, 2002 9:30 PM
> > Subject: RE: [APML] Provia F400......push?
> >
> > > Hello Bobby,
> > > I haven't pushed it yet.  I believe Don Westergren's test showed a
> > tendency
> > > toward a better color balance with pushing.  Please confirm this, I am
not
> > > at my regular computer and don't have the link to his site.
> > > Jeff
> > >
> > > -----Original Message-----
> > > From: owner-astro-photo@seds.org [mailto:owner-astro-photo@seds.org]On
> > > Behalf Of Bobby Middleton
> > > Sent: Wednesday, October 02, 2002 11:00 PM
> > > To: astro-photo@seds.org
> > > Subject: [APML] Provia F400......push?
> > >
> > >
> > > Are you guys who use this 120 film pushing it any?
> > > Bobby Middleton
> > >
> > >
> > >
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