Archived posting to the Leica Users Group, 2001/10/03
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regarding the xtol "100ml rule," it's interesting that Anchell and Troop
(as referred to by Guy) in the _Film Developing Cookbook_ page 31 state
that for full development of all images on the roll, you need to use
250ml of undilute developers: XTOL, D-76, MicrodolX, 500ml for D-76 1+1,
1000ml D-76 1+3. i have a densitometer and i suppose the responsible
thing is to try the recommendation versus the 100ml and vs 75ml.
however, ONE LITER of solution PER ROLL is a very bulky prospect indeed!!
it just about precludes processing more than one roll at a time.
Guna Sengalrayan brings us to the jobo site, where:
http://www.jobo-usa.com/jq/jq9701.htm
talks about xtol in the jobo processor.
their test indicated that for 1+1 dilutions, and AGFA film,
you needed 200ml of stock solution (400ml total) per roll, but
100ml of stock was sufficient for kodak, ilford and fuji films.
this article did not test dilutions beyond 1+1.
i use jobo tanks, but don't rotary process the film anymore.
finally, the jobo site interestingly recommended AGAINST a water
prewet, which i've been doing since i started doing film developing.
(recommended by fred picker!)
- -rei
> From: "Guna Sengalrayan" <gunas@consortio.com>
>
> >> From: Guy Bennett <gbennett@lainet.com>
> >>
> >> According to Anchell and Troop, "dilution increases speed and sharpness
> >> with XTOL. Dilutions of 1:3 or more are frequently recommended. At these
> >> dilutions XTOL is effectively a nonsolvent developer, but because of its
> >> careful buffering, grain is still fine." (Film Developing Cookbook, p.
> 50)
> >>
> >> So with XTOL in dilutions of at least 1:3, you get both the fine grain of
> a
> >> solvent developer *and* the sharpness of a non-solvent developer,
> something
> >> that has been remarked by a number of folks on this list. And as for not
> >> having enough developer at dilutions greater than 1:1, I don't believe
> it.
>
>
> >i guess you are referring to the kodak-recommended "100 ml rule":
> >
> >From Kodak J109:
> >
> > We recommend always starting with at least 100 mL (3.5 fluidounces) of
> > full-strength developer to prepare the diluted solution for each 135-36
> or
> > 120 roll (or the equivalent of 80 square inches [516 square
> centimetres]).
> >
> >in practical terms, this would imply that with a dilution of 1+3, you would
> >need 100x4=400ml of diluted solution per roll. this is roughly equivalent
> >to one reel in a 2-reel (16 oz) tank full of 1+3 XTOL.
> >
> >
> >
> >> While there is much to be said for following manufacturers' instructions,
> >> personal experience suggests that it is simply not true. (Like having to
> >> mix XTOL at 20° when other temps will also work.) Why not try it yourself
> >> and compare?
> >>
> >> Guy
>
>
> >i do often break the 100ml rule. does the 100ml rule have safety factors
> >built-in, like making sure it will work with 1-year-old developer made
> >with rusty tapwater, developing muddy-dense negatives, etc? with fresh
> xtol
> >made with distilled water, can we get down to 70-75 ml per roll?
>
> >do others break the 100 ml rule?
>
> >-rei
>
>
>
> I have broken the 100 ml rule with TriX and TMax100 and the results are
> fine. Xtol dilution was 1:3. Actual developer amount was 65ml : 195ml which
> gave a total of 260ml of solution.
>
> I tried this on Neopan 400 but had inconsistent results. On certain
> occassions the roll came out thin.
>
> Processing was done using a CPE2+ at 25 deg C.
>
> Jobo's website has an article about this and they had similar findings using
> Neopan when less than 100ml of stock was used.
>
> I would like to hear from others who has tried Neopan 400 using less than
> 100ml of Xtol stock at 1:3.
>
> -guna
>
>
>
> --
> To unsubscribe, see http://mejac.palo-alto.ca.us/leica-users/unsub.html
>
- --
Rei Shinozuka shino@painewebber.com 212-713-6256 FAX: 212-713-1482
PaineWebber Fixed Income Research, PaineWebber Incorporated
1285 Avenue of the Americas, 11th Floor, New York, NY 10019-6028
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