"piterengel" <pslaviero@[EMAIL PROTECTED]
> wrote in message
news:35678f6b-45c2-43d3-bad9-8dbb54eed173@[EMAIL PROTECTED]
> Hi all, I've seen that it is available the Rollei ATP
> film, whose
> "subtitle" is "Technical Pan". It's a long time I'm
> looking for a
> valid substitute of magic Kodal TP film, a film that could
> be treated
> also with non-standard baths such as POTA or Delagi. There
> are few
> data about this film, it is a superpanchromatic film, can
> anybody tell
> more? I really want test it, starting with very diluited
> Rodinal
> (1+100 and more). I'll let you know about results.
> Bye
> Z.
I have no direct experience with this film but you can
find a data sheet at:
http://www.maco-photo.de/files/images/PR_Rollei_ATP_111007_1.1_gb.pdf
Rather badly translated from German.
Freestyle carries this and the recommended Rollei Spur
developer. The MSDS is slightly odd because it lists what
appears to be two forms of Phenidone.
I've used quite a bit of Technical Pan over the years
mostly developed in Technidol. The results are extremely
fine grain but the combination is fussy. I found that in
order to get reasonable conrast I had to cut back
development somewhat from the recommended amount and expose
at around EI-12.
For 35mm I now use Kodak T-Max 100 in full strength
Microdol-X or Ilford Perceptol. I shoot at about EI-50 and
have no problems with high contrast highlights. The grain is
not quite as fine as Tech-Pan but very close and the
negatives begin to have the same smoothness of larger
negatives which was one of the characteristics of Technical
Pan. This should also work for other ISO-100 tabular grain
films such as Ilford Delta and Fuji Acros. Microdol-X and
Ilford Perceptol appear to be indentical. These developers
must be used at full strength to get the extra-fine-grain
effect. When diluted they become acutance developers but
with the same grain (and speed) as D-76.
Rodinal is not a fine grain developer although grain
is mostly a function of the emulsion rather than the
developer. At 1:100 it appears to suffer enough local
exhaustion to produce some "compensating" effects on many
films. This is essentially the flattening of the highlight
curve. This is not the same as overall low contrast because
the shape of the H&D curve is changed.
The same effects also generate edge effects which lead
to somewhat exagerated acutance. These may be desirable in
some cases but lead to somewhat strange looking images.
The Rollei film is evidently made by Maco, who have
made some successful films in the past. I doubt very much if
their emulsion making technology is up to Kodak's but it
appears to be the only game in town so is certainly worth
trying.
A Google search will find a lot of discussion of the
film by those who have tried it.
--
---
Richard Knoppow
Los Angeles, CA, USA
dickburk@[EMAIL PROTECTED]
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