Building a cold head....

Discussion in 'Camera Building, Repairs & Modification' started by bd3, Apr 29, 2006.

  1. bd3

    bd3 Member

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    This may be the wrong place to post this. If it is moderators feel free to move it to the proper forum. I'm new here and am looking for information on how to make a cold head for an enlarger. What kind of lamp should be used, what it should be constructed from, etc. Any help that anyone can give will be greatly appreciated.
    Bill
     
  2. resummerfield

    resummerfield Subscriber

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    Provide some background info..... What enlarger do you have? What size neg will you print?
     
  3. bd3

    bd3 Member

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    Sorry, I forgot to include that I'm going to use an old press camera as the enlarger. Will accomodate up to 4x5 negatives. Basically I want to make a Graflarger.
    Thanks,
    Bill
     
  4. Colin Graham

    Colin Graham Member

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    It might be easier to get a second hand aristo unit and convert it. Cold lamps can be kinda tricky to diy with voltage regulation and grid spacing. You could check out http://www.aristogrid.com/ for ideas about what's available.
     
  5. Donald Qualls

    Donald Qualls Member

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    I don't know that they'd qualify as "cold light" because they aren't cold cathode, but the simplest method of building your own Graflarger equivalent would probably involve buying several of the very small under-shelf type of fluorescent light fixtures, removing the ballasts and sockets from the plastic shell, and reassembling them in an array that will provide even light. The fixtures run around $15-$20 each. You'll have to watch for start-up flickers and reduced output when the tubes are cold; given you're using a camera for this, using a lens in shutter, with T setting and cable release, is probably a good idea (you can just leave the light on, or let it warm for 30 seconds before opening the shutter for an exposure).
     
  6. jnanian

    jnanian Advertiser Advertiser

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    equinox photographic sells plans on their website for building a cold light head, its cheep enough, might be worth a looksie :smile:

    -john
     
  7. DBP

    DBP Member

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    Why not just go ahead and buy a graflarger? There's one on that auction site (Item 7614638347)