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  1. #1

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    Very Unusual Parabola on my Film!

    I just got back from a trip to San Francisco and I was very surprised with what came back from the lab. At first I thought these were light-leaks, but when I finally saw the negatives, I realized that there were perfect parabolae imprinted on two rolls of my film. I can see them from the first two frames I advanced, and then vaguely (or not so vaguely as the links to the images will show) throughout the roll. At first I thought it might be scanning, but these weird parabolae are perfectly continuous.

    - I was using different lenses, so I know that's not it.
    - Meter is working fine (Zeiss Ikon).
    - Pressure plate is straight
    - Both were ISO 400 - the shots below are TMAX 400 pushed two EV. The other roll was Legacy Pro 400 (shot at box speed). The parabolae are on different parts of the film. The ones below go right through the middle, the ones I am not posting are close to the top.
    - They went through carry-on X-ray scanners twice (there and back). I know this is the easiest explanation, but seems hard to believe.

    Any thoughts?

    http://corposant.smugmug.com/North-A...12070026-L.jpg

    http://corposant.smugmug.com/North-A...12070027-L.jpg

    http://corposant.smugmug.com/North-A...12070010-L.jpg

    Granted these aren't keepers, but I find it really irritating that I don't know what is causing this to happen. My ISO 100 shots are fine.

  2. #2
    nhemann's Avatar
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    Odd effect - my only question is: Were you, and the light house, very near a black hole? lol
    "There is no such thing as objective reality in a photograph"

    My flickr and (gasp!) dpug photos - take a look if you like.

  3. #3

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    Quote Originally Posted by nhemann View Post
    Odd effect - my only question is: Were you, and the light house, very near a black hole? lol
    Well, they say there are ghosts on Alcatraz, but the Legacy Pro roll was shot on the mainland with the same effect.

  4. #4
    keithwms's Avatar
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    Out of focus hair somewhere in the camera?
    "Only dead fish follow the stream"

    [APUG Portfolio] [APUG Blog] [Website]

  5. #5
    AgX
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    X-ray scanning.

  6. #6

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    Quote Originally Posted by keithwms View Post
    Out of focus hair somewhere in the camera?
    I don't think so - it's a perfect wavelength, even on the advance frames (I take two shots at 1/2000 with the lens cap on to advance to "1" on the counter). It's something technological that's causing this. A hair would be too random.

  7. #7

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    Quote Originally Posted by AgX View Post
    X-ray scanning.
    That was my first thought - but I though X-Rays will just fog whole regions of the film, not narrow bandwidths?

  8. #8
    ath
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    These sine wave patterns are most probably from X-ray. Somewhere on the Kodak site there are illustration pictures.
    Regards,
    Andreas

  9. #9
    Sirius Glass's Avatar
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    Was your film in the luggage area or did you carry it on board?
    It is was in the luggage area, then it is almost guaranteed to be from the X-rays.

    Steve
    Warning!! Handling a Hasselblad can be harmful to your financial well being!

    Nothing beats a great piece of glass!

    I leave the digital work for the urologists and proctologists.

  10. #10

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    Quote Originally Posted by Sirius Glass View Post
    Was your film in the luggage area or did you carry it on board?
    It is was in the luggage area, then it is almost guaranteed to be from the X-rays.

    Steve
    Carried on - twice.

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