On Thu, 28 Jun 2001 10:14:56 +1000 =?iso-8859-1?Q?Rob=20Geraghty?=
(harper@wordweb.com) wrote:
> I presume you're talking C41 films here, Tony? I also presume you're
> saying
> that exposing a C41 400ASA film at EI320 "improves" the results but
> doesn't
> require any special treatment at the lab?
Yes, C41, processed normally. ISO ratings are often a bit optimistic, and
an extra half-stop or so can help reduce grain and add separation in
shadow areas by adding some density. The overlapping dye clouds softens
the appearance of grain boundaries. There's usually plenty of latitude to
accomodate this without running into highlight blocking.
Generally, if you are seeing green-blue speckle in shadows from colour neg
(look like CCD noise, but can't be - CCD noise in negs afflicts
highlights, the densest part of the film, and manifests as yellow/magenta
speckle), giving a little more neg exposure will reduce this dramatically,
as the overlapping dye clouds don't alias as badly.
Incidentally Rob, could you take a look under the hood of your mail
client. It appears to be your replies which are introducing the 'enhanced'
subject lines to list threads. I don't know why exactly, something MIME
related - see the last line below, the listserver is converting your msgs
to plain text.
From: =?iso-8859-1?Q?Rob=20Geraghty?= <harper@wordweb.com>
Subject: filmscanners:
=?iso-8859-1?Q?RE=3A=20filmscanners=3A=20Microtek=204000=20problem=2E?=
X-MIME-Autoconverted: from quoted-printable to 8bit by punt1.cix.co.uk id
f5R49l613646
Regards
Tony Sleep
- Online portfolio & exhibit; + film scanner
info & comparisons
