John Cremati <[EMAIL PROTECTED]> wrote:
Hi Donald ,I also know in the silk screen industry that they have projectionsystems where they eliminate the large negatives used to contact print ,and enlarge right on the coated silk screen...I have seen just one ofthese cameras in a old silk screen
unday, February 02, 2003 9:30 AM
Subject: Re: [Cameramakers] Light source for enlarging onto
platinum-paladium and Kodak Azo papers
>
> Hi Donald ,
>I also know in the silk screen industry that they have projection
> systems where they eliminate the large negatives used to conta
Somebody was advertising a goerz gotar as a quartz a while ago on ebay. I
don't know if it actually is a quartz lens, or if the seller was
mis-informed. A quick google search didn't turn up much. Gotars aren't
super rare and usually sell for under $100.
John
--
http://www.enteric.org
snip
>
Hi Donald ,
I also know in the silk screen industry that they have projection
systems where they eliminate the large negatives used to contact print ,
and enlarge right on the coated silk screen...I have seen just one of
these cameras in a old silk screen catalog but have never tried t
Hi John, Thanks for your kindness in sending this link on to me. It was most interesting and informative. Apparently they are using an arc lamp which by their very nature requires that they be left on in a continuous burn mode. The other thing is that they are using different pigmented emulsions
I know that the famous Fresson studio in France had
set up a Enlarger for their secret process which would need a great deal of
UV... I believe that they discuss the camera on their site... Click on the
English for the Enlgish translation... JC
http://photography.about.com/gi/dynamic/offsi
Robert Mueller <[EMAIL PROTECTED]> wrote:
Certainly if the material has appreciable sensitivity in the visible range the user would be advised to put as much light as possible in this range, where the optics are properly corrected.BobAt 01:04 02.02.03 +, you wrote:> Aren't there other issues
Certainly if the material has appreciable sensitivity in the visible range
the user would be advised to put as much light as possible in this range,
where the optics are properly corrected.
Bob
At 01:04 02.02.03 +, you wrote:
Aren't there other issues concerning the image quality that hav
There is a second reason for wanting a shutter, namely, certain (many)
kinds of discharge lamps greatly dislike being turned on and off very
often. The lifetime can be drastically shortened. Needing a
ballast and a lot of UV strongly suggest these are discharge lamps.
It is worth checking the m
Thanks for bringing those issues to bear. I think that you have a valid concern. However in looking at the spectral response on the Kodak Azo data sheet it does show a marked decrease at the 450-475 nm level. I do expose Azo (contact print) with the use of a 300 watt R40 flood. I do not have the sp
Thanks John,
I appreciate all of the information on the El Nikor transmission capabilities. I will look forward to the layout of the bulbs in your lampsource. I have located a source on the east coast that makes lamps for UV curing and they have the capability to target a given UV range. They indic
Donald,
Here are some of the treads on the discussion of
UV transmission thru El- Nikor glass from the Alternative Photo list.. I hope
this will help...
Please keep me informed of your
progress as I am extremely interested. I kind of dropped the ball after
gett
The spectrum of UV that this would involve are in the 350-450 nm range.
Robert Mueller <[EMAIL PROTECTED]> wrote:
Further comment, following my previous one! The below listed wavelengths do pass through many glasses. Focusing will be somewhat of a problem, though you might be able to something sim
Further comment, following my previous one! The below listed wavelengths
do pass through many glasses. Focusing will be somewhat of a problem,
though you might be able to something similar to what is do for IR
photography; find the right shift of focus, do it in the visible and then
make the
It depends how far into the UV you go. Many glasses transmit a fair
amount of near UV.
Which wavelength is needed for this process?
Bob
At 07:15 01.02.03 -0800, you wrote:
If I
remember right, UV doesn't like to pass through GLASS.
Gene
- Original Message -
From: DONALD MILLER
To:
Thanks John for this information. It helps move things along a little, still need to figure out the lamps that I will be using. Durst Pro indicated that they were using a 1000 watt source on the 5X7 that they were going to release. So possibly two 6 inch HID lamps. Need to figure the configuration
ene Johnson
To: [EMAIL PROTECTED]
Sent: Saturday, February 01, 2003 10:15 AM
Subject: Re: [Cameramakers] Light source for enlarging onto
platinum-paladium and Kodak Azo papers
If I remember right, UV doesn't like to pass through GLASS.
Gene
- Original Message -
From: DONALD MILLER
To
Thanks for your input everyone. I did speak with the people at Durst Pro yesterday and they are bringing to market in March a 5X7 enlarger that will be capable of enlarging both pt-pd and azo. The light source is primarily UV and is only suitable for the emulsions that I have listed. The cost of th
Aside from the glass issue, unless you've got a lot of time and a cement column for your enlarger it won't work. With many UV bulbs 1"-2" from the Pt/Pd paper, the exposuers take minutes.
However, I have known people to enlarge to Azo: 2-1/4 negs to 9" prints, and that seemed to work. The exposures
If I remember right, UV doesn't like to pass
through GLASS.
Gene
- Original Message -
From:
DONALD
MILLER
To: [EMAIL PROTECTED]
Sent: Saturday, February 01, 2003 6:39
AM
Subject: [Cameramakers] Light source for
enlarging onto platinum-paladium and Kodak A
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