why wont this work

Discussion in 'The Darkroom' started by mysteryscribe, Jun 6, 2006.

  1. mysteryscribe

    mysteryscribe TPF Noob!

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    Okay I have this idea. I develop film and paper negatives now in a daylight tank. Yes I made it myself.

    So somebody tell me why this wont work.

    I build a closed up enlarger. It it set up so that I project a light down through a negative, paper or film. Then onto a film holder with paper in it. Pull the dark slide open the top shutter for light. Close the shutter, return the dark slide.

    Put the paper from the negative holder into my dark box and load the daylight tank and develop it. A sort of contact printer or even a day lab type thing. I can't use a darkroom but I could pull this out and make small prints to my hearts content. heck I could set it up for 5x7 or even 8x 10.

    I just wonder what would be the inherant problems that I'm not seeing.
     
  2. motcon

    motcon TPF Noob!

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    given your knowledge of the art, i'll safely assume that all light issues (enlarger and transfer of exposed media) have been covered as well as measurements from light source to neg and construction.

    there are only two things that come to mind at the moment.

    1 - heat build up in the enlarger head (leading to a few issues)
    2 - is it or is it not (going to be) a contact enlarger? if not, focus becomes an issue as does possible uneven lighting and accutance issues
     
  3. mysteryscribe

    mysteryscribe TPF Noob!

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    It will be a daylight enlarger... pin hole lens. f 250 no focus to worry about.

    Pull the negative paper holder which will be the same as a film holder in a graflex type back... Take it to a dark box to load into a daylight tank.

    NO light head on it. The light souce is either daylight or a light bulb hanging over it..

    does that help .... if it is light tight all the way to the film/ paper holder is there any reason I cant use daylight as a light source...
     
  4. motcon

    motcon TPF Noob!

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    you will, more than likely, need a method (convex lens) to gather the light, although i've loaded paper in a pinhole and exposed it. long exposures and without a way to gather the light, a typical pinhole lighting effect (uneven).
     
  5. mysteryscribe

    mysteryscribe TPF Noob!

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    I've been shooting a lot of penhole cameras lately. Yes the exposure will be long very long in some cases.

    I did much better with pin hole aperture behind a lens that is true. I also made a pinhole lens for the front of a camera I rebuilt and found that it added one f stop more than the calculator called for. I am expecting that to happen again. eXposure is going to be hit or miss till I can get the calculations down. I had that with pinhole cameras to.

    Im not at all sure it will work as I expect it too. There are several articles on pin hole enlargers but none with this configuration to use in the daylight. I was really wondering if there was a basic reason you couldn't use the paper in a negative holder inside the light tight bottom chamber. The pinhole has to be in a light tight chamber as well except for the light coming through the negative. The exposure calulations should be a bear.
     
  6. motcon

    motcon TPF Noob!

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    i'm just concerned about the light gathering. light doesn't behave very well on its own.


    dug through my bookmarks and found this on solar enlargers. not much help to you, but interesting. here is an excerpt:

    May we also ask your attention to our gaslight attachment for enlargers? This consists of a parabolic reflector, in from of which are fixed two incandescent gas burners of a special type. ... The attachment can be fitted to almost any enlarger on the market." (Cost, 10s 6d - 50p).

    link
     
  7. mysteryscribe

    mysteryscribe TPF Noob!

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    Well you are probably right. I keep thinking of the early days when they used a skylight to make the prints, but im not sure they were enlargements. They might have been contacts only. This is like a mini darkroom I think. It might be that it winds up having to be a contact type thing but I really am curious now.

    I think I'll build one a see what happens. God know I have enough pin hole attachements laying around.
     
  8. mysteryscribe

    mysteryscribe TPF Noob!

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    wonder what happened to my drawing
     
  9. motcon

    motcon TPF Noob!

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    :???:


    i'm a sucker for drawings, too.
     
  10. mysteryscribe

    mysteryscribe TPF Noob!

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    I posted a drawing of the daylight enlarger but it got gone. Wonder why...
     
  11. motcon

    motcon TPF Noob!

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    well crud.
     
  12. mysteryscribe

    mysteryscribe TPF Noob!

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    Well everything worked but it was out of focus. Even with the f350 pin hole.

    upside>> I could set the exposure
    I could do a little cropping my moving the negative around on the top.
    I bought a can of peanut brittle for the can to make the top chamber.
    it didn't have any light leaks.

    downside... I could not make a print that was in focus. As a matter of fact it just got worse as I tried to fix it...

    my conclusion is that it was a good morning project but not really worth the effort. The light was predicatable and even though. I used a bit of frosted plastic as a defuser. I use it all the time so I knew it would work. The problem was i just couldn't the enlarger focused so close to the negative.

    I may revisit this later... Anyway thought someone might want to know how it ended.
     

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