[rollei_list] Re: Plus X -PX 125- and Microdol X discontinued Marvin
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <rollei_list@xxxxxxxxxxxxx>
- Date: Sat, 13 Feb 2010 19:13:29 -0800
----- Original Message -----
From: "Marvin" <marvin0@xxxxxxxxxxxxxx>
To: <rollei_list@xxxxxxxxxxxxx>
Sent: Saturday, February 13, 2010 5:21 PM
Subject: [rollei_list] Re: Plus X -PX 125- and Microdol X
discontinued Marvin
Greetings David, I recommend dilution B HC110 and the
development time of
seven and a half minutes. Any deviation from the
temperature of 20% C in my
opinion is sacrilege.
Marvin.
I tend to agree with this. B&W is more tolerant of
temperature variation because the difference in contrast it
causes can usually be corrected in printing. However, for
any sort of consistency in work the temperature should be
controlled better or development time adjusted.
I am not sure time adjustment quite makes up for
temperature. For one thing the penetration of the developer
into the emulsion which is one factor in determining the
time it takes the image to appear, varies with temperature
in a way that is dependant on the particular film. Where a
manufacturer's development time recommendations are
determined experimentally from good sensitometric data they
will take this effect into account, but, there does not seem
to be a universally applicable formula for calculating it.
--
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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