Satoru Tanno (S-sato@iacnet.ne.jp)
Fri, 22 Oct 1999 20:16:26 +0900
Hi Dave.
> > When I used Konica direct dupe lith film with diluted Ilford paper
> > developer, I could get nice results.
>
> Well, I guess I should make some correction to my earlier post in reply to
> Sato. There is dupe lith film and there is dupe contone film. I am not sure
> which one Sato is using; but for both cases, control is about the same
> (difficult).
The film I am using is dupe lith, not the ones similar to Kodak's SO-339 thatis a
contone film(the name's changed now?)
I guess Konica direct dupe lith film is no longer on the market?
>
>
> > But D-max is less than 2 step gravure film neg and highlight separation was
> > llimited.
>
> If you original negative has low density range, that it will work nicely. If
> the density range is high, you will lose highlight separation if you use
> diluted paper developer. As explained in my article in PFP journal issue #2,
> diluting paper developer can at most, reduce the density range of your
> enlarged negative, but it is not able to increase the exposure range (that
> is, it won't separate more steps for you).
>
The situation is exactly the same as in the case that enlarged negs are blown up
by continuous tone interpositives that are contact-printed from original
negs.Your interpositive has to have a low density range to get a good enlarged
neg.
All about LC-1 below sounds very intriguing to me.
I have never heard of it..
Is it manufacutred by Ilford?? as I know Ilford's LC-29.
Could you let me know more about the developer? where I can get it etc..
(Ilford Multigrade4 is a developer that is originally designed to develop photo
papers and
recommended dillution is 1:9 or 1:14)
Thanks very much for your valuable info.
Satoru Tanno
Sapporo/Japan
> By lowering the pH of the developer, however, you can let the whole
> development proceed very slowly, and this opens up the highlight area. I an
> several others have found that LC-1 dilution 2:3:x gives the combination of
> sulfite-bisulfite that slows down the development of Arista APH film just
> right so that you can have 21 step linear separation.
> In the original article, I said that we normally didn't need so much
> separation since our original wouldn't have a density range of 21 steps (or
> about 3.0 density unit), but now I am using 2:3:x every time because the nice
> thing about linear curve is that you can expose it up and down and everything
> is still proportional, and you won't worry about shadows blocking up (I am
> talking about positive now), so I have a standard procedure of making test
> strip and simply expose it 1/2 stop over the time when highlights look good
> to my eye. The shadow nevers block up.
>
> I said 2:3:x because the 3rd item is water. You can use different amount
> depending on your processing temperature and how long you want to develop
> your film. For rotary processing at 75F, I used 2:3:10 for interpositives and
> 2:3:5 to 2:3:10 for the negatives.
>
> If you haven't try it, you really should give it a try. It will give you
> separation that you have never seen before if you used diluted paper
> developer before. Here is a quote from Mr. Christopher James, the Department
> Chair of the Photo Department of the Art Institute of Boston (I did ask his
> permission to quote him):
>
> "i .... found your LC-1 development, for lith film, formula in Judy's PFP
> newsletter.... wish i had had this formula a long time ago as it beats
> the hell out of manipulating Dektol, HC-110 and D-76...."
>
> Dave S
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