Hi Philip,
I haven't read that article, but from your description it sure looks
like someone was trying to do something as suggested in LP Clerc's
Photography: Theory and Practice, Book I Fundamentals: Light, Image,
Optics, as revised by LA Mannheim and edited by DA Spencer (Focal
Press1970).
Som
I read that article -- in brief, the author took a
couple of off-the-shelf screw-on closeup lense, put
them in a tube (back to back, "front" of each lens
facing out of the tube), and experimented with
different spacing, and adding pieces of card with
holes in them to act as waterhouse stops. Wound
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
Aren't there other issues concerning the image quality that haven't been
addressed? I can think of:
(1) The enlarging lens must not only have the ability to transmit the UV
radiations which are to expose the paper, it must have the ability to form a
high quality, well-focused image in the wave
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
I don't believe that there is a copy of the article available on line. I have
a pdf file the magazine sent me before publication. If anyone wants a copy
please send me an e-mail address, I'll send it along. I think it does a good
job of providing the necessary info to go ahead with a project. Bu
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
Hi Donald,
The El Nikors will pass the UV light in the necessary range... other
lenses will not.. .. There are several threads concerning this on The
Alternative Photo list...The El Nikors use a special glass that does not
filter UV like the others... We went as far as putting the lens on
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
I am working on development of a light source to allow enlarging of images onto pt-pd and Azo papers. These papers need a light source in the upper UV band (350-475 nm). The other consideration are that these emulsions are markedly slower then conventional enlarging papers. I have two immediate con
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