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Thread: enlarger light source

  1. #1

    enlarger light source

    The time has come to build a horizontal enlarger for negatives up to 8X20. I have purchased an old 16X20 process camera and am looking for guidance on selecting a light source. I'll need to build the enclosure for the light and get a piece of opal glass for diffusion. Also, do any of you have suggestions about building the glass sandwich for the negative holder? I was considering something along the lines of the type in my Durst 138 but didn't know if Newton rings would be a problem. Thanks in advance for your ideas and shared experience.

  2. #2
    aleatorist David R Munson's Avatar
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    enlarger light source

    In terms of illumination, you should take a look in Ansel Adams' <i>The Print</u>. On page 28 in particular there is a photograph of the two different light sources he had for his 8x10 enlarger. One is a cold light setup, the other looks like a bunch of halogen bulbs on individual switches. He goes into some detail in the text. Whatever you decide, good luck and keep us posted on your progress.

  3. #3
    aleatorist David R Munson's Avatar
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    enlarger light source

    Stupid HTML...

  4. #4

    enlarger light source

    For odd size negatives I use two clean pieces of hardware store glass which I tape around the edges. The tape (3M Photographic) separates the glass by just enough space so that there is no Newton ring problem. (Dust, though!) I cut a mask from rubylith to surround the neg so stray light doesn't come through. I use a cold light head on an old Elwood 8x10 enlarger, #15 green gel to neutralize it for contrast filters, it's slow but works pretty well.

  5. #5

    enlarger light source

    Let's see if we can lose the italics...</i></i></i>. There - how's that?

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    enlarger light source

    Dave, Since your rig is horizontal, weight is not a problem and you can go really hog-wild with light sources. If you choose flourescent tubes, use a commercial grade ballast, so that they won't flicker when the switch goes on.....incandescent bulbs, cooling fans, go for it. You could even use an array of smaller bulbs, green and blue, on rheostats and do variable contrast.

  7. #7

    enlarger light source

    Thanks for the ideas. I am thinking that the flourescent idea would be the easiest and cheapest (not the only consideration but important). Of the various types of flourescent tubes are there differences that make one type a better choice? Also, what is rubylith?

    David

  8. #8

    enlarger light source

    David, Rubylith is a red acetate-backed film used in graphic design --- you can cut it easily with an Exacto knife. you could also use amberlith, which is safelight orange, or really any paper or film that would block light. Ruby or amber translucent materials let the projected image show through but would not make an exposure on b&w paper, useful if you wanted to mask out just one area of an image. I'm just using it to keep stray light away from the easel so I could use black Delta plastic just as well.

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