Engineering 1000 mm multiple pinhole lens

Discussion in 'Pinhole Photography' started by Mustafa Umut Sarac, Dec 20, 2010.

  1. Mustafa Umut Sarac

    Mustafa Umut Sarac Member

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    I want to experiment with multiple circular random placed pinhole lens. My intention is to build a 120 camera with 1000 mm lens.
    I want to drill hundred or more pinhole on to large circular brass thin plate.

    How can I decide the plate diameter , lens film distance and the count of pinholes , their diameter and placement.
    What is the result of random placement or an regular ?

    And how can I be sure every pinhole on large circular plate -15 inches diameter may be -would be effectively cast a image on 120 film 66.

    What is the engineering way to accomplish this ?

    Thank you ,

    Mustafa Umut Sarac

    Istanbul
     
  2. Jim Jones

    Jim Jones Subscriber

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  3. RalphLambrecht

    RalphLambrecht Subscriber

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  4. Mustafa Umut Sarac

    Mustafa Umut Sarac Member

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    [​IMG]

    How can I engineer this pin sieve lens for 66 and 1000 mm ?

    Umut
     
  5. RalphLambrecht

    RalphLambrecht Subscriber

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    What do you mean with engineer? Are you asking how to make it?

    Easy. Create a negative image of it (see attached), print it black-and-white at 50x scale, and then photograph it on high-contrast film at a distance of 50x the focal length. Use the piece of film as your photo-sieve lens.
     

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  6. Mustafa Umut Sarac

    Mustafa Umut Sarac Member

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    Random Discrete Fresnel Zone Plate is the above lenses name.
    Ralph , I know how to photograph something but I am sure above lens is not engineered for my purpose.
    I am asking the formulas for design similar plate for my work.

    Umut
     
  7. RalphLambrecht

    RalphLambrecht Subscriber

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  8. AgX

    AgX Member

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    I am lost, as in this thread random and regular pinsieves are mixed up.

    And to my understanding the random one is only appropiate to X-ray imaging.
     
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  9. Mustafa Umut Sarac

    Mustafa Umut Sarac Member

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    Random one is for decrease the higher order aberrations. There is no limit at the formulas to keep it for x ray. You enter the wavelenght and it gives the pin sieve.
    Ordinary zone plates are the subject for x ray imaging but ordinary cameras uses them also.
    I think x ray technology comes from the x ray lab at germany and their problem was not making ordinary camera lenses.