[alt-photo] Re: NuArc UV units question

[ender100 at aol.com]

Jeremy,


Actually it's a good question and not pedantic.  Since as you say, NUARC units vary between two machines, two ways to get some sense of what a "unit" is between the two machines is to:


1.  expose a known contrast mix of PT/PD with a step tablet for a given number of units on both machines and compare number of step


or


2.  Compare how many units it takes on each machine to properly expose a given contrast mix of PT/PD.


>From there you can compare the output of the two machines.  Standard Step Tablets are great tools!


Mark Nelson
www.PrecisionDigitalNegatives.com upadated home page





-----Original Message-----
From: Jeremy Moore <jeremydmoore at gmail.com>
To: The alternative photographic processes mailing list <alt-photo-process-list at lists.altphotolist.org>
Sent: Mon, Apr 12, 2010 2:22 pm
Subject: [alt-photo] Re: NuArc UV units question


Would it make a difference if I said 15 units, 45 units, 125 units, 250
units? Without a quantification of the amount of light against a known
standard--which there isn't with the NuArc "unit"--your question strikes me
as pedantic.

I use 45 units.

-Jeremy-

On Sat, Apr 10, 2010 at 10:48 AM, Paul Viapiano <viapiano at pacbell.net>wrote:

> OK, Jeremy...just curious here. How many units do you use to expose
> palladium with a new-ish bulb?
>
> p
>
>
>
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