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Thread: Azo Baby!

  1. #1
    bmac's Avatar
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    I am about to start playing around with my 40 year old stash of 4X5 AZO g2 &3. What is a good starting time for contact printing 4x5 negs with an enlarger? I have a Zone V1 Cold Light head installed.

    Brian
    hi!

  2. #2

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    From everything I have heard and read, you will have either a very difficult time or very long exposures. Several minutes.

    With a 300 watt bare bulb about three feet above the contact printing frame, I get exposures of between 30 seconds and a minute, without burning. When I first started contacting Azo, I tried using the flood light on a track on my kitchen ceiling. I never got an exposure time of less than about three minutes.

    dgh
    David G Hall

  3. #3
    bmac's Avatar
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    Do you have problems with hot spots with the bare bulb? And by bare bulb, I am asuming you mean a bulb hanging from the cord, no reflector... correct?
    hi!

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  5. #5
    bmac's Avatar
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    #1 thanks for the info.
    #2 Jesus, don't you people sleep?!
    hi!

  6. #6

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    If you are making 4x5 contact prints you might well be able to use your enlarger light. Just be sure to take the lens out and rack the bellows up tight. That will allow maximum light through in a circle that should easily cover the 4x5. Time? Make one test strip with exposures every 15 to 20 seconds for a few minutes. That should immediately give you some rough idea of the time.

    Michael A. Smith

  7. #7
    Ed Sukach's Avatar
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    </span><table border='0' align='center' width='95%' cellpadding='3' cellspacing='1'><tr><td>QUOTE (bmac @ Apr 28 2003, 10:10 PM)</td></tr><tr><td id='QUOTE'> #2 Jesus, don&#39;t you people sleep?&#33; </td></tr></table><span class='postcolor'>
    Sleep..???

    What means this "Sleep"?
    Carpe erratum!!

    Ed Sukach, FFP.

  8. #8

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    Brian,
    If you have the Zone VI variable contrast head, you may want to dial in the maximum blue filtration to expose Azo. Azo primarily exposes to UV light in the near UV spectrum (350- 475 nm). The cold light will probably work much better then a true tungsten source. What Michael indicated about the enlarger lens removal is helpful as well. Hope that this helps.
    Art is a step from what is obvious and well-known toward what is arcane and concealed.

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  9. #9
    David A. Goldfarb's Avatar
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    Just an addendum to that: it should be okay to use a diffused light source on an enlarger with the lens removed, but be careful trying that with a condenser enlarger. I did and it took a few days to figure out where the mysterious hotspot, rendered as a little grey spot under the lens axis, was coming from.

    I know this doesn&#39;t apply in this case, but just for the record.
    flickr--http://www.flickr.com/photos/davidagoldfarb/
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  10. #10

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    I just turn on the bathroom lights... 30 to 40 seconds are typical for me.
    Nobody ever went broke underestimating the intelligence of the American public.

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