single vs double condenser

Discussion in 'Enlarging' started by Murray@uptowngallery, Sep 20, 2007.

  1. Murray@uptowngallery

    Murray@uptowngallery Member

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    I see some enlargers configured with one or two condenser lenses.

    I thought I read somewhere a second condenser shortens the height of the enlarger.

    What is the difference in light uniformity between a single and double condenser. If spacing and height are not a concern, can a single condenser suffice?

    Thanks
     
  2. firecracker

    firecracker Member

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    I have no idea, but mine(Fuji FD690 which covers from 35mm to 6x9cm) has three. I heard the reason the 3rd condenser was added to this model was to control and even out the light for use of a 50mm lens. All the previous models in this series (Fuji 690 series) had two condensers...
     
  3. dancqu

    dancqu Member

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    The combined refractive power of a double condenser
    is great. Usual focal lengths of the pair are in the inches.
    I wonder though of lens abberations using a single lens
    condenser. Although a well corrected achromat as
    such is not the objective of a double condenser
    the pair may perform better. Dan
     
  4. Murray@uptowngallery

    Murray@uptowngallery Member

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    I forgot about aberration correction thru symmetry. Thanks