Exposure conundrum

Discussion in '35mm Cameras and Accessories' started by Anscojohn, Feb 20, 2009.

  1. Anscojohn

    Anscojohn Subscriber

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    I dealt with this once and thought I would toss it out to all the experts.
    The customer was really adament: her camera (a 35mm Nikon SLR) always overexposed her black and white film, but never her color film. Go figure.
     
  2. msage

    msage Subscriber

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    If we are talking about traditional BxW film, it might be her dev.
     
  3. archphoto

    archphoto Member

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    Color OK ?
    > ASA B&W set propperly ? >>> yes >>> wrong processing
    >>>>>>>>>>>>>>>>>>>>>>>> no >>> her own fault, adj ASA to obtain propper EI

    Reasoning: C41 is standardized, allways the same, B&W can vary

    Peter
     
  4. glaiben

    glaiben Member

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    Was she not changing ASA/EI between color and B&W films (assuming they were different)?
     
  5. Anscojohn

    Anscojohn Subscriber

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    She was changing her ASA correctly. Processing was correct.
     
  6. Anscojohn

    Anscojohn Subscriber

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    ****
    No filter for either.
     
  7. archphoto

    archphoto Member

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    Only thing left for me: too sensitive film for her chosen apperture e.i. 5.6 at 800 ASA or higher
     
  8. JBrunner

    JBrunner Moderator Staff Member

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    Her red dress always came out black.
     
  9. rthomas

    rthomas Member

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    Ok, film processing was correct, no filter factor to deal with, and film speed was set correctly... needless to say, it's very unlikely that the camera was only misfiring coincidentally with the loading of B&W film. Could it be that she simply didn't like the printing? Maybe it's a question of different exposure latitudes of the films in use and the resulting prints.
     
  10. Anscojohn

    Anscojohn Subscriber

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    She was really adament about it. What it finally came down to was something that had nothing to do with the fact of color film versus black and white film. What a lot of questioning finally brought to light was that she always shot TRI-X at normal ASA (this was a before ISO standards) and always shot Kodachrome 25 at normal ASA.
    Her camera's meter had a non-linear exposure problem that only came into play at higher ASA settings. But the customer saw it as a "black and white film" versus a "color film" problem since that was the way it manifested itself in practice.
     
  11. tiberiustibz

    tiberiustibz Member

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    I'm getting the sense that this is some sort of riddle.

    On what basis did she judge the overexposure?
     
  12. rthomas

    rthomas Member

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    What Nikon camera was that? Sounds like a symptom an old Photomic meter might exhibit if it was failing.
     
  13. tiberiustibz

    tiberiustibz Member

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    Guess I missed the deadline...
     
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  15. Anscojohn

    Anscojohn Subscriber

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  16. Anscojohn

    Anscojohn Subscriber

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    Don't remember. I know it was not an F, though; a Photomic would stick in my memory. Some of the various situations were pretty amusing: like the lady who insisted the lab "had mixed her pictures up with someone elses." Yup, it happens. And she got half a roll of her pix, and some of another person's. Yup, that happens to. And, not only that, the lab mixed up her pictures with her mother's pictures. Hmmm, sez I to meself, sez I as I put the tracer book back.. It transpired they were on vacation together; with the same P and S cameras; Is it possible, I finally ask, that perhaps you just picked up her camera by mistake one day......???. Oh, yeh, I guess that's it, sez she.
     
  17. MattKing

    MattKing Subscriber

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    I have a couple of Olympus bodies that feature metering off the film. I've always wondered if there is any significant variation of reflectivity between film types. I was going to suggest that as a cause, if no one else came up with a solution.

    Matt
     
  18. Anscojohn

    Anscojohn Subscriber

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    That's an interesting point, Matt. One would ASS u ME that the emulsion reflectance would be pretty consistent; but I wonder......
     
  19. Q.G.

    Q.G. Inactive

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    There are slight differences between films, yes.
    So you need to learn how your favourite films behave, and possibly adjust your metering accordingly.

    Old data, but illustrative all the same:
    [​IMG]
     
  20. BetterSense

    BetterSense Member

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    Is that data from Olympus? I understand that most common-speed exposures were actualy metered mostly off the shutter curtains, and only longer tripod-domain exposures metered off the film itself.
     
  21. Q.G.

    Q.G. Inactive

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    It's data from Hasselblad, to be used with their OTF flash metering.
    They measured the reflectivity of the films available then.

    You're partly right about the curtains.
    Anything of 1/60 and longer is meassured entirely (or as near as) off film.
    Faster speeds progressively more off the curtains, increasingly less off the film.

    P.S.

    Or have i got it wrong now, and is the OTF measuring only used for longer speeds indeed?
     
    Last edited by a moderator: Feb 22, 2009
  22. BobNewYork

    BobNewYork Member

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    I'll add one more for AnscoJohn. Many years back, in my dad's camera shop back in the U.K. a woman came storming in complaining that the lab had printed her pictures upside down! You got it...........she was holding the stack of photos.......UPSIDE DOWN!! I'm really not kidding! This must be forty years ago now and that sort of thing kinds sticks in your memory!!!!
     
  23. Anscojohn

    Anscojohn Subscriber

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    I can believe it, totally. And just consider....these people VOTE!
     
  24. bob100684

    bob100684 Member

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    people do that a lot, they also say things like "i need a 10x8 not an 8x10 because its horizontal".....
     
  25. Anscojohn

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    And how about the young bride who could not understand why the shoes that showed in the 5x7 did not show in the 8x10.
     
  26. Q.G.

    Q.G. Inactive

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    I don't understand that either.