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ISO speeds

  • 12-07-2010 10:24am
    #1
    sineadw
    Registered Users, Registered Users 2 Posts: 3,319 ✭✭✭


    Anyone give me a scale for stops in ISO? I want to drop 3 and 5 stops from a roll of 50 and a roll of 200. Brain is dead this morning...


Comments

  • #2
    magicbastarder
    Moderators, Category Moderators, Arts Moderators, Sports Moderators Posts: 50,895 CMod ✭✭✭✭magicbastarder


    3 stops is a factor of 2^3, so reduce to one eighth of the stated ISO.


  • #3
    sineadw
    Registered Users, Registered Users 2 Posts: 3,319 ✭✭✭sineadw


    again, brain not working. So 50 would be 6.25? And what about 5 stops? Sorry - google isn't giving it up this morning..


  • #4
    magicbastarder
    Moderators, Category Moderators, Arts Moderators, Sports Moderators Posts: 50,895 CMod ✭✭✭✭magicbastarder


    yep, three stops slower than 50 is 6.25, and five stops slower than 200 is also 6.25.


  • #5
    sineadw
    Registered Users, Registered Users 2 Posts: 3,319 ✭✭✭sineadw


    perfect - thanks! :D


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