From: Liam Lawless (liam.lawless@blueyonder.co.uk)
Date: 04/08/03-06:29:47 PM Z
Do we know for sure that Arista Pro 125 is FP4+, or is this merely an
assumption? Is sensitometric/spectral sensitivity data available for it;
might its ISO rating relate to a particular light source? If it's something
other than FP4+, maybe it's orthochromatic or even only blue-sensitive, in
which case it can only make use of a proportion of the metered light in most
picture-taking situations.
Liam
-----Original Message-----
From: Scott Wainer [mailto:smwbmp@starpower.net]
Sent: 08 April 2003 04:12
To: alt-photo-process-l@sask.usask.ca
Subject: Film Speed and Negative Development
Hi all,
Having just bought some Arista Pro 125 (aka, Ilford FP4+) I decided to run
some film speed tests. I tried Crawley's FX-37 developer, Kodak Xtol, and
D-76/ID 11 and ran into what I consider a problem. All of the developers
indicated an EI of about 12-25 with standard development using a B+W
densitometer. Increasing dilution and development effected the highlights
but not the shadows; the EI still remained 12-25. The reason for testing
Crawley's FX-37 developer and Kodak Xtol was that they are listed as
increasing speed and sharpness with greater dilutions. I also tried Sandy's
Pyrocat-HD developer and found that the film did not record anything below
zone IV. All chemistry was mixed from raw chemicals just prior to
development. I thought it might be possible that my 35mm camera's meter was
off so I took readings with a spot meter and got the same readings.
Has anyone encountered this problem before? Could my chemicals have gone bad
in less than six months? Any ideas on how I can get the film speed closer
the manufacturer's rating of 125?
Thanks in advance,
Scott
smwbmp@starpower.net
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