[pure-silver] Re: Development modifications for higher sharpness

On Mon, 25 Apr 2005, Christopher Woodhouse wrote:

[...]

> The results:
> development schemes. The 'curve' in each case, is a perfect straight line
> with no shoulder. The Neopan 400 on the other hand shows distinct signs o=
f
> highlight compensation in the more dilute developer.
>
> Would it be fair to say that the two go hand in hand? That is, you cannot
> get higher sharpness if you cannot induce highlight compensation?...or pu=
t
> the other way around, you need a development scheme that has the develope=
r
> weakening in highlight areas, so that it can produce edge effects at a mi=
cro
> level. For the same reason, the degree of development in large highlight
> areas must reduce too at the macro level?

I tried this with APX100 and DS-12 (a thin Beutler-Type developer). One
film rotated in a Jobo ATL3, one film agitated for 30s at the beginning
and 10s every 2min afterward.

The developer should enhance edge-sharpness with less agitation. I found
that it looks different than eg. D76H, but couldn't find major differences
between both agitation methods. Development times were compensated for
different agitations (IIRC 10:30min in the ATL and 13:30 with semi-stand),
but sensitometer strips weren't very different, both showed a long
straight curve (ok, my sensitometer gives only about 7 stops over 0.1d).

It seems that different films give very different reactions to
different development methods. I found no very obvious differences between
continous movement and semi-stand methods for the Deltas and APX100, so I
basically stopped worrying and run everything thru the ATL.

Gr=FC=DFe aus Hohenlohe,

=09Martin Jangowski

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