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Thread: triplet closeup lens

  1. #1

    triplet closeup lens

    Hi

    I am trying to find closeup lens, with the following specifications. EFL 350+/-20 mm, F#5, preferably a cooke triplet or tessar. Any help would be appreciated

    cheers

    simon

  2. #2

    Join Date
    Dec 2001
    Location
    NJ
    Posts
    5,011

    triplet closeup lens

    I take it that when you write "closeup lens" you mean lens that will perform well around 1:1.

    If you can live with f/7.7 - f/10 maximum aperture, there are many decent 360 mm or 14" process lenses around. If you must have f/5, you're in trouble.

    Why must you have a triplet or a tessar? There are process lenses in both designs, but 14" dialytes and 6/4 plasmats are a little easier to find. If you must have a tessar type, look for Apo Tessars, Apo Germinars, Cooke Apotals.

    Good luck, have fun,

  3. #3

    triplet closeup lens

    Hi

    thanks for the prompt reply. This would be to fit onto the front of a zoom lens that we have.

  4. #4
    Vanannan
    Join Date
    Nov 2004
    Location
    Isle Of Man
    Posts
    433

    triplet closeup lens

    Seems like a little knowledge is a dangerous thing!!!

  5. #5

    Join Date
    Dec 2001
    Location
    NJ
    Posts
    5,011

    triplet closeup lens

    Oh. You mean a 2.87 diopter. Oh. Ask Century Precision Optics what they can do for you.

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