[alt-photo] Re: NuArc UV units question

[david drake]

Loris,

Is the light integrator eye in that little hole in the rubber vacuum  
pad?
I can't see were else it could be? Unless it's not in the base of the  
unit but up beside the lamp. This would be good to know, especially if  
one was making very large prints and it go covered up!
Also, I do have the 26-1K model.

thanks
david


On 10-Apr-10, at 3:48 AM, Loris Medici wrote:

> 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
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david drake photography
www.daviddrakephotography.com