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Thread: Gundlach Achromatic Meniscus Portrait f6 16-1/4" f stops: 6, 8, 12, 16, 24?

  1. #1
    Tin Can's Avatar
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    Gundlach Achromatic Meniscus Portrait f6 16-1/4" f stops: 6, 8, 12, 16, 24?

    I have a nice one in hand, I have read about it below,

    http://www.largeformatphotography.in...l=1#post170873

    http://www.largeformatphotography.in...l=1#post699038

    Galli Pics lost here. http://www.largeformatphotography.in...l=1#post255337

    and of course here, page way down http://www.antiquecameras.net/softfocuslenses2.html


    The f stops are odd, is this some other system? It's marked f6, f8, f12, f16, f24. Any ideas about the stops?

    And no the iris is not unscrewing for me. But I didn't try really hard.

    I will be shooting it with same era glass plate later tonight.

  2. #2
    Jim Jones's Avatar
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    Re: Gundlach Achromatic Meniscus Portrait f6 16-1/4" f stops: 6, 8, 12, 16, 24?

    The progression of f stops is logical, starting from f/6 and decreasing the exposure one stop for each of the marked stops. Using traditional f/numbers is better if one is using DOF charts or exposure guidelines from film data. The system on the Gundlach may be better for the less technical photographer who prefers a consistent system starting with the maximum aperture of the lens instead of the familiar f/number series.

  3. #3
    Tin Can's Avatar
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    Re: Gundlach Achromatic Meniscus Portrait f6 16-1/4" f stops: 6, 8, 12, 16, 24?

    Thanks, Jim. It does look geometrical. I just never saw that progression before.

    I am definitely the less technical photographer.

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