[alt-photo] Re: NuArc UV units question

[ender100 at aol.com]

By the way Paul, my NUARC with a new bulb was running about 320 units for 15 minutes for a Palladium + Na2  2s mix,  so don't feel too bad with the difference in time vs sun printing.  Usually with a tube unit I get around 5-6 minutes, depending on the unit.


Mark Nelson
www.PrecisionDigitalNegatives.com





-----Original Message-----
From: Paul Viapiano <viapiano at pacbell.net>
To: The alternative photographic processes mailing list <alt-photo-process-list at lists.altphotolist.org>
Sent: Mon, Apr 12, 2010 2:49 pm
Subject: [alt-photo] Re: NuArc UV units question


Thanks, Mark... 
 
That basically what I meant. 
 
I know there's a big tendency here for people to say "Do your own homework" and usually rightfully so, but when troubleshooting a machine sometimes another's experience helps point one in the right direction. 
 
I also know that many variables (paper, humidity, etc) can alter exposure times/units as well, but you usually won't see differences in factors of five or ten... 
 
Paul 
 
----- Original Message ----- From: <ender100 at aol.com> 
To: <alt-photo-process-list at lists.altphotolist.org> 
Sent: Monday, April 12, 2010 12:37 PM 
Subject: [alt-photo] Re: NuArc UV units question 
 
> 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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