Keith Schreiber (jkschreiber@worldnet.att.net)
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.
Keith Schreiber
jkschreiber@worldnet.att.net
-----Original Message-----
From: Charles Walters <CWalters@ColoradoCollege.edu>
To: 'alt-photo-process-l@sask.usask.ca' <alt-photo-process-l@sask.usask.ca>
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.
CW
Charles Walters
Darkroom Supervisor/
Photo Instructor
Colorado College Art Department
(719) 389-6369
cwalters@coloradocollege.edu
FAX (719) 389-6882
This archive was generated by hypermail 2.0b3 on Thu Oct 28 1999 - 21:39:29