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#21
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It has answered the question by making me think and I come up with the inverse square law answer. The neg in the enlarger is a long way from the print(2 feet) instead of right next to it in the contact prints so the light travel is vastly greater. On the other hand in a contact print of 36 x 35mm negs, my contact exposure time is not much different from one neg in the carrier which is projected onto paper 2 feet away as opposed to be sandwiched against the 36 negs. So maybe it all down to the speed of the Lodima paper? I am confused. What's the explanation? Thanks Mike |
#22
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Mike, silver chloride contact papers like Lodima are incredibly slow compared to papers designed for enlarging.
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"To the attentive eye, each moment of the year has its own beauty, and in the same field, it beholds, every hour, a picture which was never seen before, and which will never be seen again" Ralph Waldo Emerson. Timespresent Arenaphotographers |
#23
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Thanks Trevor. Can you also help me to improve my reading of posts as well?. I have just realised that your 60W lamp is 8 inches( two apostrophies there, not one) away NOT 8 feet which might have lead me to the slowness of the paper as the real reason :
Mike |
#24
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Mike, I over looked your mention of 8 feet instead of 8 inches otherwise I would have pointed that out.
__________________
"To the attentive eye, each moment of the year has its own beauty, and in the same field, it beholds, every hour, a picture which was never seen before, and which will never be seen again" Ralph Waldo Emerson. Timespresent Arenaphotographers |
#25
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It's not impossible to projection print onto contact speed paper - back in the 70's when there was a lot of cheap document & technical material around and I had no money I tried all of these, expect maybe a 20 minute exposure with full aperture. But then you will also probably run into reciprocity failure effects, with an exposure this long, so you'll have to burn in for another stop in the corners...it's not what the material is made for.
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#26
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Also, does the Lodima manufacturer provide any specific instructions about how to process this particular paper? |
#27
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Keith, I find these lamps (also with ES fitting and other wattage) very good in providing a very even illumination. Especially as my set up places the lamp just 8" from the paper. The further the lamp is from the paper the more even the illumination will be (within reason). You have to balance this with reasonable exposure times. With this lamp and distance my negatives give me an average exposure of 20-25 seconds.
The pre-production paper I got didn't have any information whatsoever, but there is a fair bit here. Look under 'writings'. And here PS. The lamp is fixed above the neg+paper.
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"To the attentive eye, each moment of the year has its own beauty, and in the same field, it beholds, every hour, a picture which was never seen before, and which will never be seen again" Ralph Waldo Emerson. Timespresent Arenaphotographers Last edited by Trevor Crone; 11th August 2009 at 08:11 PM. Reason: additional info. |
#28
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Table-lamp for holding the bulb?
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#29
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Keith, the lamp is in a purpose built light box which I originally built for Pt/Pd printing using UV lamps. I remove the UV lamps and add the bulb I linked to. It is just in an ordinary bayonet cap lamp holder which is screwed to the top of the cupboard. I've connected it to an enlarger timer made by Viponel which I bought on Ebay. That way I'm assured of accurate and repeatable timing.
It is best to have the lamp suspended/fixed above the contact printing frame to ensure the lamp is central and illumination is as even as possible. If you have a spot meter this is easy to check. Or do a 'grey flash', that is expose a sheet of paper until you just get a light to mid-grey tone, any uneveness of illumination is very appparent. Knowing where any uneveness is, usually the corners, is just a case of 'burning in' to even out the tones. Some people place a piece of opal glass/plastic between the lamp and printing frame, which is said to help even out the illumination. I've not tried this so can't say from personal experience.
__________________
"To the attentive eye, each moment of the year has its own beauty, and in the same field, it beholds, every hour, a picture which was never seen before, and which will never be seen again" Ralph Waldo Emerson. Timespresent Arenaphotographers |
#30
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I know where there is a Marrutt CP450 Contact-Printer for sale as mentioned in ILFORD MONOCHROME DARKROOM PRACTICE by Jack H Coote on page 151, but I don`t know much about them.
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Lodima Fine Art Contact Paper | Trevor Crone | Monochrome printing techniques | 7 | 21st April 2009 06:32 PM |