Digital BW, The Print

Hi David,

I make slides of flat work a fair bit (my wife is a painter). Slides are
unforgiving compared to negative film so the color temperature of your light
source is a significant issue as is exposure, You need to drive the lamps at
their rated voltage. If you want dead on accurate color you may find that a
color temperature meter and a set of cc filters will be a good investment.
You can pick up the Minolta II series on ebay from time to time for a
reasonable amount and they work just fine. An incident light meter will tend
to give you better exposure data than a TTL in camera (in my opinion).
Processing is another variable and not everyone has tight quality control
but I would bet that if the exposure and color temp are right on that
processing would not be a major issue.

Roger

 -----Original Message-----
From: David Wroblewski [mailto:dawroblewski@...]
Sent: Wednesday, November 05, 2003 10:14 PM
To: DigitalBWThePrint
Subject: [Digital BW] Color slides of Ultrachrome prints... magenta?


  Hi all, I had a strange experience today and I need some
  advice. I discovered a public art opportunity in my area with
  short notice last week. They require 5 slides of my
  prints for judging. These are B&W prints made on a 2200 with
  the standard UltraChrome inks, standard Epson driver.

  I'd never shot slides of prints before, but I decided to set
  up my 35mm Nikon and shoot a roll of Ektachrome 64T tungsten
  balanced film. How hard could that be? I closed the vertical
  blinds, taped the prints to a black matt board & hung them on
  a wall, set up a couple of tungsten photo lights (3200K)
  (not strobes) and exposed 36 slides for 1/4 second, based on
  my spotmeter reading (with some aperture-based bracketing to
  cover my bets.) No filter on the camera or in front of the
  lights.

  As far as I understand, this is all standard operating procedure
  for photographing flat artwork. Though as I say, I've never done
  this before.

  I just picked up the slides. They were exposed correctly, but
  every one has a deep magenta cast. The prints looked nicely
  neutral to my eye when shooting.

  I could shoot another roll of slides, but I don't understand
  what I ought to change. Is it possible this is a function
  of metamerism in the UC inks that only appears on color film?
  (That sound ridiculous to me--I'm embarrassed to even state the
  question. But there it is.) Has anyone shot slides of UC prints
  as described above and got neutral results? Or can someone guess
  from the above description what sort of dopey mistake I made?
  Could the lab that processed the film have screwed them up
  somehow?

  Thanks for all advice,
  David

  ps. I know I could find a service bureau to print the slides
  from a digital file, or use Scala, but I thought this would be
  both cheaper and faster. In the future, when I have more time to
  prepare, I imagined I would use Scala.





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