[pure-silver] Reflection step wedges differ..
- From: "J.R. Stewart" <jrstewart@xxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Mon, 17 Jan 2005 10:53:38 -0500
Anyone know the target reflection densities of the Agfa step wedge? I'm
comparing one side by side to Stouffer's (both are 21 steps), and step 1 is
distinctly different between the two. On Stouffer's wedge, Step 1 looks
paper white (whiter than my papers, anyway); on Agfa's, Step 1 is Zone VIII
reflectance to my eyes.
I'm assuming Stouffer's Step 1 is close to its specification of 0.05
density, but it's not calibrated. I'm also assuming Agfa's Step 1 is close
to 0.1, because its density does appear to be between Stouffer's #1 (.05)
and Stouffer's step 2 (.15).
I wonder if anyone has advice about which step to use to determine paper
scale: Agfa Step 1 or Stouffer Step 2, or something else? If I had a
reflection densitometer it wouldn't be an issue. Using my eyes alone, I'm
tempted to use Agfa Step 1 as the best Zone VIII reflectance.
BTW, anyone know why Stouffer begins at 0.05 and then jumps to 1.5---
doesn't that completely jump over the usual density of Zone VIII, or 0.1
that most of us are interested in?
Thanks.
J.R. Stewart
Leesburg, VA
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