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Re: [OM] pushing film

Subject: Re: [OM] pushing film
From: John Hermanson <omtech@xxxxxxxxx>
Date: Wed, 07 Jan 1998 12:22:26 -0500
Back in high school I used to soup Panatomic X in Acufine (or was it Plus X) and
ended up with microscopically invisible grain.  Great developer!

John
Camtech

Gene Mayeda wrote:

> Peter:
> Can you get a product called Acufine? Back in the early '70s the local
> newspaper photographers used to use and recommend it.When I used to buy
> it it came with instructions for pushing.I used Tri-X with it.Someone
> described it to me as a more powerful D-76(ID-11).The development times
> were shorter than D-76.I think it is made in Chicago.I had ok results
> with it using the rule of thumb 50% more time for each stop increase in
> exposure index.The basic speed setting was about 1200, in those days,
> with Tri-X.Your contrast will increase and your shadow detail will
> decrease as you push your under exposed film to higher exposure
> indexes.This is useful in low contrast light sometimes.Zone system users
> underexpose and extend development to get negs with increased
> contrast.The apparent speed difference is just a bonus with them.T-Max
> 3200 works well but it is grainy.You will get more shadow detail with
> T-Max 3200 and T-Max developer than with a slower film.Have fun!
>
> Shawn Wright wrote:
> >
> > On  7 Jan 98 at 11:33, Peter Leyssens wrote:
> > >
> > > I'm sorry if this isn't OM-content.  Does anybody know a web site that
> > > can help me experiment with pushing film ?  I've only found one web site
> > > that had a table with development times, but nothing like 'general
> > > guidelines'.  I'm using Illford HP5 and the table went up to 1600ASA.
> > > Now, what do I do if I want to push it to 6400 or higher ?  I know the
> > > film won't be performing at its best then, but I just want to experiment
> > > a bit *grin*
> > >
> > I've had surprisingly good results with HP5+ at 1600 and stock Microphen, 
> > using
> > Ilford's data. ie: 8x10s with acceptable grain and amazingly good shadow 
> > detail
> > and tonal range. Don't even bother pushing Delta 400 - it falls apart after 
> > one
> > stop in my experience.
> >
> > I have a URL at home which lists further push times, I'll try to
> > post it tonight. I think the key is to use a high energy developer like
> > Microphen and use it STOCK.
> > You may want to do some zone tests to establish speeds and dev times when
> > going beyond a 2 stop push. I think the guideline is something like 50%
> > increase in dev time for each 1 stop push.
> >
> > ========================
> > Shawn Wright
> > Computer Systems Manager
> > Shawnigan Lake School
> > 250-743-6240
> > swright@xxxxxxxxx
> >
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