Why the light streaks?

Discussion in 'Color: Film, Paper, and Chemistry' started by nbagno, Sep 16, 2013.

  1. nbagno

    nbagno Subscriber

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    Film is Kodak Porta 160, Camera Fuji GW690III, Tripod with cable release. The frames in question were shot at higher exposures and I am guessing that the frames with the streaks were between 8-16 seconds, maybe 4-8. I didn't record the frame/exposure information. Other frames on the same roll with shorter exposures did not streak. I doubled my metered exposure after reading a test on Porta 160 and the need to at least double the exposure after 1 second. Any thought on why the highlights have streaks?

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  2. polyglot

    polyglot Member

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    It looks like the winding-on commenced before the shutter was properly closed, though it's interesting that the streaks go opposite directions. Any chance of a shutter-damage issue?
     
  3. nbagno

    nbagno Subscriber

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    Guess I can't rule anything out. No issues with any other shots before or after these. One other detail is that I used a cable release and the shutter speed was set to "T" so I used a stop watch to judge when to let go.
     
  4. Bill Burk

    Bill Burk Subscriber

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    T is meant for you to push your cable release twice! Once to open, then once to close. Maybe that IS the problem then.

    The shutter might have automatically closed halfway through winding.

    B is meant for you to push the cable release to open, and then let go to close.
     
  5. E. von Hoegh

    E. von Hoegh Member

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    Indubitably.
     
  6. nbagno

    nbagno Subscriber

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    Operator error... Why just streaking on the highlights?
     
  7. E. von Hoegh

    E. von Hoegh Member

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    Because they're highlights. You were using what, 8 to 16 second exposures? Highlights are the only parts bright enough to be recorded on the film while you were winding and before the shutter closed. You're lucky it didn't jam/damage the camera, BTW.
     
  8. Bill Burk

    Bill Burk Subscriber

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    They're so bright - just a little time on the film shows up.

    The shadows needed the long exposure time to appear, not much image forms in a short time.

    Did you turn the camera over between shots? Like mount tripod center column upside down to get the low angle interior?
     
  9. nbagno

    nbagno Subscriber

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    Yikes... I love this camera
     
  10. nbagno

    nbagno Subscriber

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    Don't think I turned it over.
     
  11. polyglot

    polyglot Member

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    Maybe you accidentally put one of the negs in the scanner upside down. The first one's pretty symmetric...

    I also note the notch in the film-gate on the top-right of the first one is not present on the second though it could be present/invisible at left. I reckon one of them is scanned backwards and it's a winding-on issue as described above.
     
  12. Bill Burk

    Bill Burk Subscriber

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    Haaa, No. This looks like San Juan Bautista... Both images are "right-reading".

    I wonder if the tripod could possibly have been jarred. Again just before winding on but not the winding that created the streak - the jarring of the camera on tripod.
     
  13. nbagno

    nbagno Subscriber

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    There were just quickly scanned to show the problem so they could have been in any direction. Also didn't blow off any dust :smile:
     
  14. nbagno

    nbagno Subscriber

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    Yep, San Juan Bautista