World Pinhole Photography Day or What I was going to submit.

Discussion in 'Pinhole Photography' started by jon.oman, Apr 25, 2010.

  1. jon.oman

    jon.oman Member

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    I never read the WPPD rules, so I thought I could use an image that I had taken near the actual day. That is what happens when you don't check things out! I took these on a great weather day early last week. As it says, it is the US Customs House in Charleston, South Carolina.

    Homemade 4x5 pinhole camera.
    Kodak Tri-X 320 film.

    #1
    [​IMG]

    #2
    [​IMG]

    I'm trying something today, inside, but the exposure is loooooooong! I'm not sure if it will work, but if it does, I will submit it.

    Jon
     
  2. Lorna

    Lorna Member

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    Gorgeous
     
  3. DWThomas

    DWThomas Subscriber

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    Too bad you jumped the gun on the date, you've definitely got the hardware and the technique in hand! Though I fell back to medium format this year, I have to admit 4x5 (and up) does seem to produce the sharpest and most impressive results.
     
  4. jon.oman

    jon.oman Member

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    Thanks guys!

    Jon
     
  5. jon.oman

    jon.oman Member

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    On World Pinhole Photography Day, it rained all day. So, I was forced to find a subject indoors to photograph. Here it is, nothing really interesting, but what was available.

    [​IMG]

    The interesting thing about this image, is that it took 9 HOURS to expose! A problem with reciprocity of the Tri-X 320 film I was using.

    Jon
     
  6. bsdunek

    bsdunek Subscriber

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    Well, I messed up a knee in a fall, so I'm stuck in the house. My Wife brought me my Mamiya 23 equipment and I found a nice shot right in the family room. Now all I have to do is get down to the darkroom and process it.
    Jon, yours is fine.
     
  7. jon.oman

    jon.oman Member

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    Thanks!

    I hope you are up and about soon.

    Jon
     
  8. Thomas Bertilsson

    Thomas Bertilsson Subscriber

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    Nice pictures!

    I haven't processed my film yet, but I shot almost two rolls of 120 in a ZeroImage 2000 (the only pinhole camera I plan on owning, results are good enough for me).

    However, if the rain isn't pouring down - why not go out anyway? :smile:

    - Thomas


     
  9. jon.oman

    jon.oman Member

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    Thanks!

    Because with all the rain, there was a lot of lightning, as well as wind. A light drizzle would not have stopped me!

    Jon
     
  10. Thomas Bertilsson

    Thomas Bertilsson Subscriber

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    That's the spirit! :D

     
  11. Rodex

    Rodex Member

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    How did you find out what the exposure time was?
     
  12. jon.oman

    jon.oman Member

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    I found this link:

    http://pinhole.stanford.edu/equations.html

    Towards the bottom of the page is "Reciprocity Calculations". I used the one for Tri-X.

    With the formula in hand, I wrote a small Java program to generate an exposure chart. The chart contains the indicated (metered) exposure (1 second, 2 seconds, etc.) and the reciprocity exposure time.

    Jon