Keith Schreiber (firstname.lastname@example.org)
Thu, 01 Apr 1999 12:27:37 -0700
Something along the lines of the NuArc 26-1K Mercury Vapor unit is usually
considered a point source, at least in comparison with a fluorescent unit.
Personally, I think this is a mis-characterization, since the NuArc unit,
which has a vacuum base of 23x27 inches, utilizes a reflector of
approximately 16x20 inches.
I had access to one of these for a while and used it along with my home-made
fluorescent units for a couple years. Once calibrated to each other to
accommodate different timing methods, I found no discernible difference that
could be attributed to the light source. I would be most impressed by anyone
who could look at pairs of prints, one from each light source, and be able
to consistently identify which was which. That said, I want to point out
that I use in-camera large-format negatives. There may well be something
physically different about film produced by an imagesetter that would
respond differently to the different light sources.
And don't forget - the sun is the ultimate point-source.
From: Charles Walters <CWalters@ColoradoCollege.edu>
To: 'email@example.com' <firstname.lastname@example.org>
Date: Thursday, April 01, 1999 10:17 AM
Subject: RE: Trials and Tribulations of the Digital Neg.
Based on the discussion below, could someone recommend point sources for
palladium printing digital negatives?
Thanks in advance.
Colorado College Art Department
FAX (719) 389-6882
This archive was generated by hypermail 2.0b3 on Thu Oct 28 1999 - 21:39:29