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  1. #21
    Murray@uptowngallery's Avatar
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    Sep 2003
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    Like Gary said...I was starting to wonder if there was some inadvertent focussing of the lamp due to an unfortunate combination of enlarger component positioning.

    I recently started looking for reading material on point source enlarger light sources, and apparently it is common to get 'burn spots' when the lamp isn't where it should be...unfortunately I don't know what the proper combination is that eliminates the phenomenon.

    Now that I think about this a bit more, is it possible the lamp was actually focussed on the negative instead of spread out to cover the neg. properly? This would be another way of saying wrong lamp position relative to the optics.

    These are 'armchair' suggestions, just ideas to examine.

    Murray
    Murray

  2. #22
    Guillaume Zuili's Avatar
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    I had the same problem few years ago. I had just changed the bulb on my Durst 138. As bulbs were phased out I had a different one and stronger. That circle came up. Tried to smooth it with by putting some opaq glass in between. It worked at first but as soon as you expose long enough that circle was coming back.
    This is why I switched all my enlargers with cold light. No more weird circle or illumination.

  3. #23
    Peter Williams's Avatar
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    I narrowed the problem down to the lens mounting ring. This lens came with a silver colored mounting ring and it was reflecting inside the lens cone and creating the ring. So now I have a print of that negative without and ring. I was very pleased that I finally figured it out (with all of your help) and she looks me in the eye and says, "I liked it better with the ring."
    If you can't answer a man's argument, all is not lost; you can still call him vile names.
    - Elbert Hubbard

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