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  1. #1

    Join Date
    Sep 2002
    Location
    Nuernberg, Germany
    Posts
    214
    I've been using my enlarger (condenser head) as a light source for my 8X10" contact prints, together with a contact printing frame. Would I be getting better results with a cold head, or by removing the condensers? I seem to remember reading something about point light sources being the optimal choice for contact printing.

    Ideas? Comments?

    Thanks!
    - William Levitt

  2. #2

    Join Date
    Sep 2002
    Posts
    651
    If you are contact printing you should be using Azo. Best light source is a 300 watt light bulb.

    Azo info at www.michaelandpaula.com

  3. #3

    Join Date
    Sep 2002
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    William if you check at unblinkingeye.com you will see a very good article by Sandy King about UV sources. I know this is not what you are looking for, but if we use the analogy, those sources which are "point sources" seem to be sharper for contact prints. For my pt/pd prints I have a Nu-Arc plate burner and a home made box with UV fluorescent bulbs. The Nu-Arc produces sharper images with more contrast, and it is a mercure vapor point source. I have never tried to get one of this for regular enlarging but the test prints I do for pt/pd I do with my Zone VI and the come out really nice. I would say if you remove the condensers in your enlarger you will get light fall off, maybe not. Try and see, and see if you notice any difference in the prints.

  4. #4
    michael9793's Avatar
    Join Date
    Feb 2003
    Location
    Fort Myers, Florida, USA
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    ULarge Format
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    I use the UV light source from Michael Smith I got for enlarging. I just take the lens out and move my besslar up to 26" and use that time. most contact prints on Azo are running around 7-15 sec. It works good on graded paper too but very fast I have to stop way down then I use the light with Oreintal Seagul.

    michael Andersen
    "Capturing an image is only one step of the long chain of events to create a beautiful Photograph” See my updated website: mandersenphotography.com

  5. #5

    Join Date
    Nov 2007
    Location
    SE.London
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    Multi Format
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    547
    When making VC gelatine silver contact prints I use my Multigrade enlarger head as the light source. Ideal for split-grade printing.

    For Pt/Pd printing I use ECF BLB (black light blue) 9 x 25 watts. This is a pic of my homemade UV light box.
    Attached Thumbnails Attached Thumbnails UV light box 2.jpg  

  6. #6

    Join Date
    Mar 2003
    Location
    Greenville, SC
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    For printing with AZO I use a 12 watt BL spiral fluorescent bulb at about 36" from the printing frame. Output is controlled with am Olix light integrator. For other kinds of silver printing (only for testing) I substitute the 12 watt BL bulb with a 5 watt night light.

    Typical exposures are in the 30 second range.

    Sandy





    Quote Originally Posted by michael9793 View Post
    I use the UV light source from Michael Smith I got for enlarging. I just take the lens out and move my besslar up to 26" and use that time. most contact prints on Azo are running around 7-15 sec. It works good on graded paper too but very fast I have to stop way down then I use the light with Oreintal Seagul.

    michael Andersen



 

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