U of S | Mailing List Archive | alt-photo-process-l | Re: UV light meter

Re: UV light meter

Hi Paul,

Your always-the-same-sun-in S. Cal. is right on target. When I was living and printing pt/pd in Santa Barbara (sheesh, a quarter century ago) there was amazing consistency between 10am and 4pm for much of the year. Well, at least that was the case if the city were not on fire. ;^)

For the past 15 years I've used an Olec plate burner with integrator and it's been a perfect joy if you don't mind the fan noise. I duct the hot air from the cooling fan (the unit idles at 1,000 W and exposes at 5,000W) outside in the warmer months and let it pour into the darkroom in the winter. Average exposure for a digital neg is around 3 minutes; that would be shorter but I keep a sheet of Rosco #111 diffusion material on the vacuum glass. It's a holdover from way back when I was testing linescreen imagesetter negs. The diffusion actually served to warm the image a good bit. I doubt the Rosco is doing anything except acting as neutral density nowadays but 3 minutes gives me time to coat the next print.

Happy printing,



On Jun 17, 2009, at 4:04 PM, Paul Viapiano wrote:

No, I always expose in full sun. In southern California, a sunny day never changes. There is zero cloud cover and it is consistent. As long as you expose during the time window for various times of the year, you are practically guaranteed consistent results.

I have no intention of buying the UV meter or the Olec unit...just thought I'd throw that out there.


----- Original Message ----- From: "Loris Medici" <mail@loris.medici.name >
To: <alt-photo-process-l@usask.ca>
Sent: Wednesday, June 17, 2009 11:46 AM
Subject: Re: UV light meter

Paul was that exposing by indirect UV? I mean open shade...

Anyway, that's one (-) point for exposing under sun by UV index theory. I haven't had time to check this by numbers myself yet. Will definitely return with the results I get...


On 17.Haz.2009, at 21:29, Paul Viapiano wrote:

We were talking about exposing in the sun/outdoors, and the possibilities of measuring the UV for that purpose.

However, I found (for me!) that exposure for pure palladium prints hardly changed whether the UV index was 4 or as high as 10-ish, as measured by an online weather station close to me.


----- Original Message ----- From: "dkfreed" <dkfreed@whidbey.net>
To: <alt-photo-process-l@usask.ca>
Sent: Wednesday, June 17, 2009 10:34 AM
Subject: Re: UV light meter

Paul, et al

What would you be using this UV meter for?

On Wed, 17 Jun 2009 08:11:40 -0700, Paul Viapiano <viapiano@pacbell.net
Hi all...
We were talking about a device like this a few months ago, and happened
to find this just now.