Film for making zone plates?

Discussion in 'Pinhole Photography' started by smieglitz, Sep 2, 2007.

  1. smieglitz

    smieglitz Member

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    I used to make zone plates by photographing the concentric pattern at various magnifications with Kodak Technical Pan film and then contact printing that onto Kodalith or Ortho Litho. With the demise of Tech Pan, what would be an available super fine-grained 35mm b/w film still on the market to use as a substitute?

    I'm also thinking I may just be able to photograph onto lith film directly though it may be more difficult to nail the correct exposure without blocking up the pattern.

    Thoughts?

    Joe
     
  2. donbga

    donbga Member

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    Joe,

    Oddly enough I was thinking about doing this myself the other day. Perhaps TMAX 100 could be used instead.
     
  3. Ole

    Ole Moderator Staff Member Moderator

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    Something like Rollei ORTHO 25, perhaps? That has the added advantage of a clear film base, so there's no extra light loss.
     
  4. Steve Smith

    Steve Smith Member

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    If you have the zone plate pattern in a CAD or graphics program format, it may be better to send it out for photo plotting to graphic arts film.

    This would give a more dense black on a clear film with no mid tones. It is the type of film we (at work) use to expose our screen printing emulsions with.

    I did draw up a zone plate once but did not get round to having it made into film.


    Steve.
     
  5. smieglitz

    smieglitz Member

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    Don,

    The pdf files here for a a 75mm zone plate at 100x or 25x images of 59mm and 75mm zoneplates and zonesieves may be of some use. These are both from the Stanford site pages on pinhole photography.

    I'm teaching an alt course this semester and want the class to make some zone plates so the above should be very helpful. I'd like to try out the zonesieve myself having never done so previously.

    Joe

    p.s., Here's a zone plate smiley:
     

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  6. nicolai

    nicolai Member

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  7. Murray@uptowngallery

    Murray@uptowngallery Member

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    Chris Ellinger on the other side of the state is making them. He sent me one, but I don't know what it's on...

    I'll see if I have an email address & PM you.
     
  8. DarkroomDan

    DarkroomDan Subscriber

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    Chris does incredible work with zone plates I have one of his prints, Twilight Tents, hanging on the wall here over my desk

    Take a look at his web site http://www.ellingerphoto.com/ZPX.html

    He also can be found on the B&W Zone Plate forum over at f295.

    Dan
     
  9. rpsawin

    rpsawin Subscriber

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  10. dslater

    dslater Member

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    I would think Gigabit, Bluefire Police, or ADOX CM20 film would work as well as tech pan for this application.