Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 71,901   Posts: 1,584,422   Online: 781
      
Results 1 to 6 of 6
  1. #1

    Join Date
    Mar 2005
    Shooter
    ULarge Format
    Posts
    873
    Images
    24

    90 Degree 8x10 pinhole camera

    I know I should be able to come up with an answer to this question, but I can't quite get my head around it. So help me out.

    I am planning to build an 8x10 pinhole camera. I want it to have a 90 degree angle of view. How far (i.e. what focal length) should I put the pinhole from the film plane to get a 90 degree angle of view.

    Thanks,

    Allen

  2. #2
    Will S's Avatar
    Join Date
    Nov 2004
    Location
    Madison, Wisconsin
    Shooter
    8x10 Format
    Posts
    714
    Images
    34
    The wikipedia entry on pinhole cameras has the formula, but see:

    http://home.online.no/%7Egjon/pinhole.htm
    "I am an anarchist." - HCB
    "I wanna be anarchist." - JR

  3. #3

    Join Date
    May 2003
    Location
    Cheyenne, Wy
    Shooter
    Multi Format
    Posts
    32
    If you go to mrpinhole.com it has a calculator for all that stuff. Its listed under the camera wizard I believe.
    [FONT=Comic Sans MS]The Center for Desease Control just called. I have pegged the needle on their machines with this photography bug I have.[/FONT]

    Michael J. Taylor

  4. #4
    Jon King's Avatar
    Join Date
    Sep 2002
    Location
    New Hampshire
    Shooter
    Medium Format
    Posts
    360
    Images
    14
    For 90 degree coverage, it should be half the distance you want covered at the ground plane, whether you want the 90 degree coverage to be the film diagonal or the 10" side.
    Jonathan
    -----------------------------------------------

  5. #5
    Donald Qualls's Avatar
    Join Date
    Jan 2005
    Location
    North Carolina, USA (transplanted from Seattle)
    Shooter
    Multi Format
    Posts
    1,845
    Quote Originally Posted by Jon King
    For 90 degree coverage, it should be half the distance you want covered at the ground plane, whether you want the 90 degree coverage to be the film diagonal or the 10" side.
    Dingdingdingdingding!!! We have a winner!!!

    If you want 90 degree horizontal, you'd use a 5 inch projection distance (assuming landscape format); if you want 90 degree corner to corner, you'd use a projection distance of about 6.4 inches.
    Photography has always fascinated me -- as a child, simply for the magic of capturing an image onto glossy paper with a little box, but as an adult because of the unique juxtaposition of science and art -- the physics of optics, the mechanics of the camera, the chemistry of film and developer, alongside the art in seeing, composing, exposing, processing and printing.

  6. #6

    Join Date
    Mar 2005
    Shooter
    ULarge Format
    Posts
    873
    Images
    24
    Thank you all for you responses. I will try a 5" pinhole on my 8x10 to check out the angle of view, before getting down to building a special camera for my project.

    Allen



 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



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