From: Joachim (joachim@microdsi.net)
Date: 04/13/00-08:37:40 PM Z
> -----Original Message-----
> From: Joachim Oppenheimer [mailto:joachim@microdsi.net]
> Sent: Wednesday, April 12, 2000 5:09 PM
> To: alt-photo-process-l@sask.usask.ca
> Subject: RE: Kodak Azo Paper Question
>
>
> A few observations regarding AZO paper since the recent article
> by Michael A. Smith in March/April "View Camera": I have used it
> for years with an ancient contact print box. It has all the
> dynamic range Ansel Adams raved about. Its longer shelf life is
> surely related to the slow photic reaction of silver chloride,
> the thing that makes it ill-suited for enlarging and which
> provides its wide tonal range. The two distinct disadvantages are
> the tendency of the paper to crinkle, requiring drymounting and a
> dry press, but more significantly the prints have a somewhat
> nauseating greening color. The latter can be readily overcome by
> toning (selenium, usually) and the prints tone very readily and
> also split tone beautifully. These disadvantages are obviously
> not insurmountable. Bromide enlarging papers are fast,
> chlor-bromide a compromise between fast bromide and slow
> chloride. Contact printing is less flexible than light controls
> in enlarging, but some degree of control is possible in a print
> box by turning lights off selectively and using masking
> materials. Tonal range flexibility with AZO can be achieved to
> some degree in development (Selectol Soft, for example) but AZO
> contact, more than enlarging papers, demands a very good
> negative. JOACHIM
>
> > -----Original Message-----
> > From: Richard Maddox [mailto:slow_emulsions@yahoo.co.uk]
> > Sent: Tuesday, April 11, 2000 10:13 AM
> > To: alt-photo-process-l@sask.usask.ca
> > Subject: Re: Kodak Azo Paper Question
> >
> >
> > Uh,
> > Do you have the sheets for grades '0', '4' and '5'?
> > these are the ones I am missing. Since it was '43-'46
> > that you mentioned, perhaps the curves for all 6
> > grades are on one data sheet.(?)
> >
> > "...the old Kodak Reference Handbook",
> > Is this the title? When was it published?
> > Is it the same thing as the Kodak Data Guide?
> >
> > --- Richard Knoppow <dickburk@ix.netcom.com> wrote:
> > > It should be kept in mind that a negative will
> > > print more contrasty on a
> > > condenser enlarger than it will on a contact printer
> > > or diffusion enlarger.
> > > The difference is about a paper grade. A negative
> > > which prints right on #2
> > > paper on a condenser enlarger will need #3 paper to
> > > have the same contrast
> > > when contact printed.
> >
> > Good point.
> >
> > But would you really expect to see the same amount of
> > contrast loss with the contact printer? Perhaps so, I
> > just thought the contact print would have a bit more
> > contrast than the diffusion enlargement....
> > My powers of reasoning are on strike most of the time,
> > so would you entertain this purely theoretical
> > question...how does contrast change with increasing
> > enlarging distance? I am thinking that it must
> > decrease, since there is light loss from both
> > highlight and shadow areas, but once the shadows are
> > depleted, contrast has no where to go except down.
> >
> > If this is so, is it an issue someone enlarging would
> > ever have to deal with? Perhaps some one who has made
> > a number of very small and very large prints from the
> > same negative would have noticed if contrast was
> > affected or not.
> >
> > Does your information hint at any difference between
> > earlier AZO version(s) and the AZO available today?
> > I belive what I might have been thinking... was that
> > perhaps AZO has changed over this century, growing in
> > speed and perhaps with changes in its contrast...
> > reflecting changes in the type of negatives which were
> > being made....
> >
> > Just curious,
> >
> > RM.
> >
> >
> > ____________________________________________________________
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> >
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