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Thread: Why 160?

  1. #1
    AlexG's Avatar
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    Why 160?

    I've been dying to know this for years.


    Why 160 ISO/ASA? Why is 160 such a good speed? Why are most "professional" portrait films 160?

    Even my light meter goes 25, 50, 100, 160, 200, 300....and so on.


    Why is 160 so special?


    Alex

  2. #2
    jnanian's Avatar
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    clocks go clockwise because of the sundial

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    160 is just a number on the scale.
    One that corresponds to a value on the old DIN scale as well (every DIN value step is 1/3 ASA step).
    ISO 160 is ISO 100 + 2/3. Your lightmeter should also have 125, ISO 100 + 1/3.

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    Chris Nielsen's Avatar
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    If clocks go clockwise because of the sundial and sundials run anticlockwise in the southern hemisphere, then clocks down here should run anticlockwise as well, shouldn't they?

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    Is it because it is not as fast as 200, and not as slow as 125?
    2F/2F

    "Truth and love are my law and worship. Form and conscience are my manifestation and guide. Nature and peace are my shelter and companions. Order is my attitude. Beauty and perfection are my attack."

    - Rob Tyner (1944 - 1991)

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    Ektagraphic's Avatar
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    Maybe when they tried to develop a new emulsion something went right at ISO 160 so others followed...
    Helping to save analog photography one exposure at a time

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    Cuz it's kewl!!

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    jnanian's Avatar
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    Quote Originally Posted by Chris Nielsen View Post
    If clocks go clockwise because of the sundial and sundials run anticlockwise in the southern hemisphere, then clocks down here should run anticlockwise as well, shouldn't they?
    you mean they don't ?!
    i think you need to ask for a refund

  9. #9
    tiberiustibz's Avatar
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    They probably found a speed improvement that gave them the fine grain they wanted at 160 ASA. Ektar is 100 ASA though.

  10. #10
    Ektagraphic's Avatar
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    Maybe it's because it eliminates the need for a complany to offer a 100 and a 200 speed film. 160 is pretty much in the middle.
    Helping to save analog photography one exposure at a time

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