Switch to English Language Passer en langue française Omschakelen naar Nederlandse Taal Wechseln Sie zu deutschen Sprache Passa alla lingua italiana
Members: 69,952   Posts: 1,522,742   Online: 950
      
Page 1 of 2 12 LastLast
Results 1 to 10 of 11
  1. #1
    PhotoPete's Avatar
    Join Date
    Aug 2005
    Location
    Waltham, MA
    Shooter
    Multi Format
    Posts
    320

    Making zone plates with a printer

    Does anyone have experience printing zone plates, pinholes or megapinholes with a printer?

    Did you use a laser or inkjet? What was the DPI of the printer? What kind of material did you print on?

    Thanks for the help.

  2. #2
    blaze-on's Avatar
    Join Date
    Nov 2004
    Location
    Riverside, CA
    Shooter
    Multi Format
    Posts
    1,432
    Images
    61
    Matt's Photo Site
    "I invent nothing, I rediscover". Auguste Rodin

  3. #3
    PhotoPete's Avatar
    Join Date
    Aug 2005
    Location
    Waltham, MA
    Shooter
    Multi Format
    Posts
    320
    Quote Originally Posted by blaze-on
    Thanks, but I'm not interested in buying a zone plate. I am interested in making them. I have found a number of useful sites to generate the designs, such as:
    http://www.whizkidtech.redprince.net/zoneplate/, but I am interested in anyone's practical experience actually printing the things out.

  4. #4
    Ole
    Ole is offline
    Ole's Avatar
    Join Date
    Sep 2002
    Location
    Bergen, Norway
    Shooter
    Large Format
    Posts
    9,280
    Blog Entries
    1
    Images
    31
    Print one with whatever printer you have, at whatever resolution your printer gives. Print it on something transparent, if you have that. If not you can print it on paper, then trace it on film using a pen.

    It's a simple interference pattern, designed for one single wave length at one single focal length: It takes a lot before the picture gets visibly softer than it already is!
    -- Ole Tjugen, Luddite Elitist
    Norway

  5. #5
    Jim Jones's Avatar
    Join Date
    Jan 2006
    Location
    Rural NW Missouri
    Shooter
    4x5 Format
    Posts
    1,781
    I downloaded a zone plate from www.whizkidtech.redprince.net/zoneplate for a 20 inch focal length and printed a transparancy of it on an old 600 dpi HP Laserjet, and the results was so awful that I'm not going to mount and photograph with it. A high resolution zone plate from that site could be printed as a large image on paper. That could be scaled down by copying onto litho film or another high contrast film such as Tech Pan developed for maximum contrast.

    A 5000mm zone plate for solar or lunar photography downloaded and printed on the same printer looked almost good enough to try. Exposures for the full moon might barely be practical. If I put this much effort into lunar zone plate photography, I'll download a high resolution zone plate and scale it down onto high contrast film.

  6. #6
    Ole
    Ole is offline
    Ole's Avatar
    Join Date
    Sep 2002
    Location
    Bergen, Norway
    Shooter
    Large Format
    Posts
    9,280
    Blog Entries
    1
    Images
    31
    Get the Pinhole Designer from www.pinhole.cz - calculates pinholes and zone plates, output to pdf.
    -- Ole Tjugen, Luddite Elitist
    Norway

  7. #7
    Jim Jones's Avatar
    Join Date
    Jan 2006
    Location
    Rural NW Missouri
    Shooter
    4x5 Format
    Posts
    1,781
    Quote Originally Posted by Ole
    Get the Pinhole Designer from www.pinhole.cz - calculates pinholes and zone plates, output to pdf.
    That's a very nice calculator. However, for optimum on-axis resolution I suggest a user constant of 1.6 instead of the two provided constants. Those two constants might be better for the wider coverage we often want from pinholes.

  8. #8
    PhotoPete's Avatar
    Join Date
    Aug 2005
    Location
    Waltham, MA
    Shooter
    Multi Format
    Posts
    320
    My concern has been getting the blacks to print dark enough to be truly opaque- I haven't been able to do that with either my HP or Canon inkjets. I will try a laser printer.

  9. #9
    htmlguru4242's Avatar
    Join Date
    Aug 2005
    Location
    Sandy Hook, CT
    Shooter
    Multi Format
    Posts
    973
    I'd say that getting these somehow onto high-contrast film (lith film, copy film, what have you) would probably work better. That'll tend to give better blacks, clear lights and allow for easier & higher resolution zone-plates.

  10. #10
    PhotoPete's Avatar
    Join Date
    Aug 2005
    Location
    Waltham, MA
    Shooter
    Multi Format
    Posts
    320
    I think you're right about the HC film. My early tests have all come out uniformly gray- I think the inkjet blacks are just not sufficiently opaque. I was hoping to avoid having to buy lith film and developer for this effort, but I may have to go that route.

Page 1 of 2 12 LastLast


 

APUG PARTNERS EQUALLY FUNDING OUR COMMUNITY:



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