[rollei_list] Re: Rolleiflex 2.8C and two developers
- From: Chris Burck <chris.burck@xxxxxxxxx>
- To: rollei_list@xxxxxxxxxxxxx
- Date: Thu, 30 Jan 2014 19:13:11 -0500
LOL!
I'm not sure how we've gotten to this point. I understand how the RS
works. :)
Richard said something about using it "full strength", and when you replied
you said something about "stock solution". All I was trying to do was
point out what these terms mean.
If one dilutes the concentrate to 1 gallon, then this is the working
solution. It is not the stock solution also. I understand your reasoning,
but this is not the way those terms are used; not their meaning. In other
words, rather than being "the stock
solution and the working solution at the same time", it is the
*replenisher* and the working solution at the same time.
I've read Sexton's comments on that LFP page a number of times.
Interesting stuff.
On Jan 30, 2014 3:45 PM, "CarlosMFreaza" <cmfreaza@xxxxxxxxx> wrote:
> Chris:
> The point is that you need to mix parts A and B adding
> water to complete 1 gallon or 3.8 litres, this is is the stock
> solution and the working solution at the same time, there is no a
> specified dilution fot the T-Max RS developer. I put 500ml in my
> Paterson tank and develop a 120 roll. If I use the repleshniment
> system, I discard 45 ml of used developer for the next roll and add 45
> ml of fresh developer for it; this way the fresh solution is the
> "stock" solution and the used developer including the 45ml of fresh
> solution is my 500ml "working solution", but there is no dilution,
> it's the same solution unused and used. Anyway, I did not use the
> replenisher system, I only used the entire developer several times.
>
> As I wrote previously, there are no issues about short developing
> times for T-Max films developed with T-Max RS developers; however I
> found this issue for the Ilford PanF+ ISO 50, since the recommended
> development time is 4 minutes and 5 minutes is the minimal recommended
> development time to get an even process. Kodak does not mention any
> dilution for the T-Max RS despite these short development times and
> the "Digiltal Truth" massive development chart keeps Kodak
> instructions, 4' at 20ºC. However, some users in forums in the web
> suggest to mix Part A and Part B as a concentrated solution and to
> dilute it 1:9 or 1:15 to use it like one shot developer for some
> lighting situations, f.example :
> http://www.largeformatphotography.info/articles/sexton-tmax.html
>
> Carlos
>
> 2014-01-30 Chris Burck <chris.burck@xxxxxxxxx>:
> > Richard,
> >
> > Yes, I understood from the earlier messages that the RS is a two part
> > developer. However, since Kodak describes it as "to make 1 gallon" (for
> the
> > small size), I took that to mean that the dilution is the dilution is the
> > dilution, as it were. In other words, if the bottle indicates a
> dilution of
> > 1:4 (or multiple dilution options), then that's your working solution.
> >
> > That detail about replenishing with half-strength solution sounds awful
> > strange, though I admit that's not the only thing I find strange about
> > T-Max. Kodak's Publication J-86 (which, oddly enough, doesn't specify a
> > recommended dilution for the RS, though it does for the standard T-Max)
> > makes no reference to such a practice. Where did you hear this?
> >
> >
> >
> > On Thu, Jan 30, 2014 at 1:09 PM, CarlosMFreaza <cmfreaza@xxxxxxxxx>
> wrote:
> >>
> >> 2014-01-30 Chris Burck <chris.burck@xxxxxxxxx>:
> >> > Carlos,
> >> >
> >> > There may be some confusion of terminology here. Many powder
> >> > developers,
> >> > such as D76, are mixed into a stock solution which, due to its higher
> >> > concentration, has better keeping qualities. This solution is then
> >> > further
> >> > diluted at the time of processing, by whatever ratio is
> >> > desired/recommended
> >> > (typically 1:1 with D76). This is referred to as the "Working
> >> > Solution".
> >> >
> >> > With liquid developers, the concentrated developer straight out of the
> >> > bottle, is essentially "Stock Solution". "Working Solution" (or
> >> > "Working
> >> > Strength Solution"), is what you get after mixing with water (in the
> >> > case of
> >> > T-Max, 1:4 or 1:9, per Kodak's recommendations).
> >> >
> >> > Based on what I read in your last message, you were using working
> >> > solution,
> >> > not stock solution.
> >>
> >> You are right in general Chris, however there is an issue regarding
> >> the T-Max RS, it has two liquid parts and you need to mix them like
> >> you need to mix powders to obtain a stock solution. It's true that the
> >> mixed solution or "stock" solution is a workable solution too, but
> >> since you need to add 45 ml of fresh solution to your tank each time
> >> you develop a 120 roll if you use the replenisher system, the fresh
> >> solution is a "stock" solution to add to your used developer despite
> >> they are the same solution, one unused, the other one used. Kodak only
> >> talks about to use the mixed A and B parts to develop films and this
> >> is the way I used it, but you could dilute this solution according
> >> some users and then you have a one shot workable solution where the
> >> original mixed solution works again like "stock" solution.
> >>
> >> Carlos
> >> ---
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> >
> >
> >
> > --
> > ¡Ay, Pachamamita! ¡Eres la cosa más bonita!
> ---
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