Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 71,928   Posts: 1,585,182   Online: 689
      
Results 1 to 9 of 9
  1. #1
    Mustafa Umut Sarac's Avatar
    Join Date
    Oct 2006
    Location
    İstanbul - Türkiye
    Shooter
    35mm RF
    Posts
    3,966
    Images
    108

    Engineering 1000 mm multiple pinhole lens

    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. #2
    Jim Jones's Avatar
    Join Date
    Jan 2006
    Location
    Rural NW Missouri
    Shooter
    4x5 Format
    Posts
    1,865
    Go to http://pinhole.stanford.edu/zp.html for a brief discussion of pinsieve.

  3. #3
    RalphLambrecht's Avatar
    Join Date
    Sep 2003
    Location
    Central florida,USA
    Shooter
    Multi Format
    Posts
    6,845
    Images
    1
    Mustafa

    The last page of this may also help:

    http://www.waybeyondmonochrome.com/W...ographyEd2.pdf
    Regards

    Ralph W. Lambrecht
    www.darkroomagic.comrorrlambrec@ymail.com[/URL]
    www.waybeyondmonochrome.com

  4. #4
    Mustafa Umut Sarac's Avatar
    Join Date
    Oct 2006
    Location
    İstanbul - Türkiye
    Shooter
    35mm RF
    Posts
    3,966
    Images
    108


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

    Umut

  5. #5
    RalphLambrecht's Avatar
    Join Date
    Sep 2003
    Location
    Central florida,USA
    Shooter
    Multi Format
    Posts
    6,845
    Images
    1
    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.
    Attached Thumbnails Attached Thumbnails sample.jpg  
    Regards

    Ralph W. Lambrecht
    www.darkroomagic.comrorrlambrec@ymail.com[/URL]
    www.waybeyondmonochrome.com

  6. #6
    Mustafa Umut Sarac's Avatar
    Join Date
    Oct 2006
    Location
    İstanbul - Türkiye
    Shooter
    35mm RF
    Posts
    3,966
    Images
    108
    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. #7
    RalphLambrecht's Avatar
    Join Date
    Sep 2003
    Location
    Central florida,USA
    Shooter
    Multi Format
    Posts
    6,845
    Images
    1
    Mustafa

    Send me a private email, and I'll share the math with you.

    info@darkroomagic.com
    Regards

    Ralph W. Lambrecht
    www.darkroomagic.comrorrlambrec@ymail.com[/URL]
    www.waybeyondmonochrome.com

  8. #8
    AgX
    AgX is offline

    Join Date
    Apr 2007
    Location
    Germany
    Shooter
    Multi Format
    Posts
    9,087
    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.
    Last edited by AgX; 12-20-2010 at 07:17 PM. Click to view previous post history.

  9. #9
    Mustafa Umut Sarac's Avatar
    Join Date
    Oct 2006
    Location
    İstanbul - Türkiye
    Shooter
    35mm RF
    Posts
    3,966
    Images
    108
    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.



 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



Contact Us  |  Support Us!  |  Advertise  |  Site Terms  |  Archive  —   Search  |  Mobile Device Access  |  RSS  |  Facebook  |  Linkedin