[alt-photo] Re: NuArc UV units question

[Loris Medici]

Paul my brand new 26-1KS (different bulb - NP80) 120 secs. equals to
1:15 - 1:30 (roughly)... The placement of the integrator eye is in the
middle of the back edge of the vacuum glass and it's looking directly
/ exactly to the lamp. (<- This important!)

Probably it's a lamp issue -> 9 1/2 minutes for gum is too long for
sure; with my BLB unit I was exposing 6 minutes for 15% AD sensitizer
(1:1 with gum/pigment) "using paper negatives"!!!

Hope this helps,
Loris.


2010/4/10 Paul Viapiano <viapiano at pacbell.net>:
> Hi all...
>
> Just got around to playing with a NuArc 26-1K I picked up a while back. It's
> in beautiful shape, everything works well but I have a question.
>
> I took at least 120 units (120.0 on the readout) to get a decent ball park
> gum exposure, but it took 9 1/2 minutes to reach that level. That seems
> awfully long to me. My sun exposures with the same negs are 2 - 2 1/2
> minutes.
>
> Now, I know they're not going to be the same but I'm wondering about the age
> of the bulb here. So can anyone tell me how long an exposure in UV units is
> so I can compare? Anyone with a fresh, or close to it, bulb? Any process at
> all, doesn't matter. I just want to see what 120.0 units times out to on
> another machine...
>
> Thanks everyone...
>
> Paul