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  1. #1

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    Weston Master II - Weston or ASA?

    Emulsion speeds set for the Master II are Weston or ASA?
    Is there some specific ratio allowing conversion? Dan

  2. #2
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    I used to have a Weston Master V, but I don't recall it being marked with anything but ASA speeds, but it might have had DIN (German) speeds, too. The old ratio of DIN to ASA was a log-like conversion, I believe, where 14 DIN was 25 ASA, 17 DIN was 100 ASA, etc. The current ISO standard changed the method by which film speeds are lab tested. I'm not sure if there's a direct ASA:ISO ratio.
    [COLOR=SlateGray]"You can't depend on your eyes if your imagination is out of focus." -Mark Twain[/COLOR]

    Ralph Barker
    Rio Rancho, NM

  3. #3

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    The III is in Weston so I can only guess the II is to. The IV is in ASA.

    IIRC 80 Weston is 100 ASA. The Weston meter website might have some info.

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  5. #5

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  6. #6

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    Quote Originally Posted by dancqu
    Emulsion speeds set for the Master II are
    Weston or ASA? Is there some specific ratio allowing
    conversion? Dan
    How about that! It was working fine earlier in the day. I was
    going to give it another usefull EV evaluation. IIRC from last
    years' check the Master II was "usefull" down to EV 6 or 7.

    Now I'll be zinc air battery shopping for my Sekonic L-228.
    The mercuries it came with test good but they have how
    many years on them, is anyone's guess.

    BTW, the Weston speeds were developed in 1932. They
    processed the film and, it would seem, created the film speed
    system we use today.

    There may have been some detail changes but I'm quite sure
    ASA speeds and ISO are the same. Or is it were the same.
    It has been maybe 30 years since the change to ISO. Dan

  7. #7

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    Quote Originally Posted by dancqu
    How about that! It was working fine earlier in the day. I was
    going to give it another usefull EV evaluation. IIRC from last
    years' check the Master II was "usefull" down to EV 6 or 7.

    Now I'll be zinc air battery shopping for my Sekonic L-228.
    The mercuries it came with test good but they have how
    many years on them, is anyone's guess.

    BTW, the Weston speeds were developed in 1932. They
    processed the film and, it would seem, created the film speed
    system we use today.

    There may have been some detail changes but I'm quite sure
    ASA speeds and ISO are the same. Or is it were the same.
    It has been maybe 30 years since the change to ISO. Dan

    Here is a small conversion chart I found on the "Net. I have a Weston Master II Cine' that I use occasionally. It works great, but I did have to make a little conversion table that I laminated and hang on the string (the dials are all marked for Cine' measurements)

    If your meter suddenly stopped working, there is a likely fix on the internet. http://www.daniel.mitchell.name/came...westonmtr.html
    Ken T.



 

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