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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