[rollei_list] Re: Plus X -PX 125- and Microdol X discontinued Alan
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <rollei_list@xxxxxxxxxxxxx>
- Date: Thu, 18 Feb 2010 11:02:27 -0800
----- Original Message -----
From: "Eric Goldstein" <egoldste@xxxxxxxxx>
To: <rollei_list@xxxxxxxxxxxxx>
Sent: Thursday, February 18, 2010 10:44 AM
Subject: [rollei_list] Re: Plus X -PX 125- and Microdol X
discontinued Alan
If I'm understanding you, your quibble is with the phrase
"working
ISO" and that changing the working speed of a film is not
changing the
ISO definition of the film speed? If so, I sure did not get
that from
your original post. You just detailed in numerous posts the
importance
of (what I consider to be trivial) changes derived from
choice of
developer... surely you recognize the usefulness of pushing
and
pulling to control contrast and help make images printable.
I will agree that charts like the Massive Development and
others do
not make clear that changing the working speed of the film
will effect
contrast and texture, but I don't think that is their
purpose...
Eric Goldstein
I think the term Exposure Index, which I think is Kodak
speak is useful. It is the value one plugs into an exposure
meter. Where development is not as prescribed by the ISO
standard the EI can be different. Saying ISO or ISO speed
means specifically the speed as determined using the method
described in the ISO standard. Many practical situations
require a different developer than was used in obtaining the
ISO speed or require different contrast index, etc, which
will affect the EI. The only time the ISO speed applies is
when the conditions of use are as assumed by the standard.
--
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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