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  1. #11

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    Sep 2006
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    Well, it appeared that my problem was my old Dichro 45S light source after all. I went through all the recommendations posted here earlier once more (even the plumb line) before I finally just replaced the light source with a new Aristo D2 cold light.

    Both light sources measure 6 1/4" across at the diffuser. However, the Aristo visibly seats down further/deeper into the enlarger than the 45S does, and the problem I was having with the corners of the 4x5 film carrier not being illuminated went away.

    I don't think this problem was intentional; my thinking is that something somewhere in the design or materials must have changed between the time my 45S was made and when my 45MXT enlarger was manufactured. I've read in a few places that the bellows material of the MXT is thicker than previous enlargers (it won't compress as much), and I can see that my MXT has a foam light seal on the negative stage (not present on the older enlargers) that is adding a little more space between the light source and film.

    So, with the new closer light source my enlarger works great now. Woot!
    Last edited by konakoa; 11-04-2008 at 10:50 PM. Click to view previous post history.

  2. #12
    jeroldharter's Avatar
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    Nov 2005
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    Could it have been the lens board as well? Sometimes I think the 150 mm lenses require a little extension cone on the lens board.
    Jerold Harter MD

  3. #13

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    Jerold, I'm certain it was the light source all along, not the lens.

    I don't think Beseler makes a extension cone (please correct me if I'm wrong) as they're just not needed. The bellows on my MXT are fairly long -- I just measured about 11" of extension from the negative to the top of the lens. I'm barely using half of that for my 135mm lens, so I doubt a 150mm lens would be a problem either.

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