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Thread: Gossen vs. Sekonic meters - don't mix em

  1. #81

    Join Date
    Sep 2003
    Location
    Portland, OR
    Posts
    726

    Gossen vs. Sekonic meters - don't mix em

    "you delivered the meter the exact same intensity light"

    Quick answer before I go to bed -

    I gave the meter light from a tunsten bulb of approximately 2800K color temp. The light then passed through the spectrophotometer which using a diffraction grating, split that 2800K light up into individual wavelengths. Then meter then made readings at the wavelengths indicated in the chart.

    Your hypothetical "ULM" will always be at the whim of whatever light source it is reading. SO you need to compare the graph I presented with a graph of a 2800K light source and look for the differences. THe differences will be due to the spectral characteristics of the meter.

  2. #82

    Join Date
    Apr 2004
    Location
    SF Bay Area, California, USA
    Posts
    306

    Gossen vs. Sekonic meters - don't mix em

    Kirk,

    Great work! Your results are quite similar to the ones I got 20 years
    ago for my Minolta Flashmeter III (my meter's response was pretty much
    limited to 460–710 nm, but the curve shape was similar).

    Bill,

    I think what you really want is a match to the film response rather than
    uniform response from 400–700 nm. A good match for IR film is shown
    in this

    graph
    ; of course, both the meter and the camera have 89B filters. A
    perfect match to say, Tri-X, would be a bit more difficult because of that
    film's rising sensitivity toward the UV end of the spectrum.

    Again, although I'd love a perfect match that could be set to every
    individual film, I could live with far less as long as the response was
    halfway sensible and reasonably consistent among all of my meters. I don't
    need perfection to get reasonably good exposures.

    I eagerly await the results for the Spot V ...

  3. #83

    Join Date
    Sep 2003
    Location
    Portland, OR
    Posts
    726

    Gossen vs. Sekonic meters - don't mix em

    "I eagerly await the results for the Spot V ..."

    I finally got the cover off my Spot V meter last night, and it looks like the bulb in it is ok - I get a continuous circuit across it, about 30 ohms, and it looks litke there is about 3+ volts going to it when I press the button. So I'm stumped at this point as to why it doesn't work...

    I'll see if I can borrow a friends meter.

    Kirk

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