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  1. #71
    benjiboy's Avatar
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    Quote Originally Posted by pentaxuser View Post
    That inconsistency was extremely dangerous as well. He was called Joseph Stalin or is that the other South Georgia

    pentaxuser
    Or is it the South Georgia in the South Atlantic ?
    Ben

  2. #72

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    Quote Originally Posted by Steve Smith View Post
    I sometimes use a Johnson's Exposure Disc.

    It takes the time, date, scene and weather into account and is surprisingly accurate.


    Steve.
    A pity that these exposure discs or a copy aren't available anymore. The Black Cat guides seem to be aimed at colour reversal films and digital cameras rather than B&W negative films.

  3. #73
    Steve Smith's Avatar
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    Quote Originally Posted by Keith Tapscott. View Post
    A pity that these exposure discs or a copy aren't available anymore. The Black Cat guides seem to be aimed at colour reversal films and digital cameras rather than B&W negative films.
    You can use this text version of how mine works:


    Start with a number depending on ISO used:

    ISO 25 8
    ISO 50 9
    ISO 100 10
    ISO 200 11
    ISO 400 12
    ISO 800 13
    ISO 1600 14

    Add a number depending on the scene:

    Strong sun with white clouds +4
    Strong Sun +3
    Weak, hazy sun +2
    Dull +1
    Very dull 0


    Add a number depending on the time and date:

    May to August, 10 am to 3 pm +4
    May to August, 8-10 am, 3-6 pm +3
    May to August, 7-8 am, 6-7 pm +2
    September, October, March & April, 10 am to 3 pm +3
    September, October, March & April, 8-10 am, 3-6 pm +2
    September, October, March & April, 7-8 am, 6-7 pm +2
    November to February, 10 am to 3 pm +2
    November to February, 9 to 10 am +1


    And finally, subtract a number depending on the scene:

    Open sea and sky and scenes from the air 0
    Distant landscapes and beach and snow scenes -1
    Open landscapes and scenes with light foreground -2
    Groups in the open and near views of houses and trees -3
    Distant buildings and wide streets -4
    Scenes with heavy foreground and near landscapes -5
    Close up portraits in the shade and scenes in heavy shade -6
    Bright interiors -7
    Dull interiors -14 (disc says rotate twice)

    As a test, put in some standard sunny 16 settings:

    ISO 100, start with 10
    Bright sunny day, use strong sun setting adding 3 = 13
    For mid day in June, add 4 = 17
    For an open landscape, subtract 2 = 15

    The numbers are EV or Exposure value numbers. EV 15 is 1/125 at f16 which is what sunny 16 recommends for these conditions

    Steve.

  4. #74
    Bill Burk's Avatar
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    Quote Originally Posted by Steve Smith View Post
    You can use this text version of how mine works:





    Steve.
    Cool, you reverse engineered the Johnson's Exposure Disc?

  5. #75
    Steve Smith's Avatar
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    Quote Originally Posted by Bill Burk View Post
    Cool, you reverse engineered the Johnson's Exposure Disc?
    Exactly!


    Steve.

  6. #76
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    Quote Originally Posted by Bill Burk View Post
    ...the Johnson's Exposure Disc?
    Somehow that just doesn't sound appropriate!
    Kick his ass, Sea Bass!

  7. #77
    Steve Smith's Avatar
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    Quote Originally Posted by Dinesh View Post
    Somehow that just doesn't sound appropriate!
    I was sitting on the bus to work playing with my Johnson... wait, that doesn't sound right either.

    Anyway, I was trying out different settings with the disc on the way to work and realised that all it was really doing was adding notches of movement when putting in the settings on one side and subtracting them from the other side so it didn't take long to work out a starting point working backwards from known sunny 16 settings.


    Steve.

  8. #78

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    Quote Originally Posted by Steve Smith View Post
    I was sitting on the bus to work playing with my Johnson... wait, that doesn't sound right either.

    Anyway, I was trying out different settings with the disc on the way to work and realised that all it was really doing was adding notches of movement when putting in the settings on one side and subtracting them from the other side so it didn't take long to work out a starting point working backwards from known sunny 16 settings.


    Steve.
    As I finished setting up the camera, I realised I had left my exposure meter at home, so I whipped my Johnson out.....


    I have an old exposure calculator that sounds very much like the Johnson but isn't. I'll dig it up and post whatever it is. I've used it, and it works pretty well.

  9. #79

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  10. #80
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    I find that sunny 16 gives very reliable results, but the actual advice to use f/16 seems geared toward slide film. I prefer to give more shadow exposure and deliberately prefer to expose up to 2 stops more than sunny 16 when I use negative film. If I was using transparency, though, I would use sunny 16.
    f/22 and be there.

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