How much faster is f/0.95 vs. f/1.7?

Discussion in 'The Watering Hole' started by Jock Elliott, Mar 31, 2016.

  1. Jock Elliott

    Jock Elliott SC All-Pro

    Jan 3, 2012
    Troy, NY
    In stops, that is.

    I have seen various formulas for making the computation (the squaw of the hippopotamus and all that), but I'm having trouble grokking them.

    Cheers, Jock
  2. Luke

    Luke Super Moderator

    Nov 11, 2011
    Milwaukee, WI USA
    Real Name:
    a stop and half is my guess.... or is it less than a stop?
    • Appreciate Appreciate x 1
  3. Lightmancer

    Lightmancer Super Moderator

    Aug 13, 2011
    Sunny Frimley
    Real Name:
    Bill Palmer
    In stops, it depends how you count it.
    1.7 - 1.4 - 1.2 - 0.95 would get my vote.
    • Agree Agree x 1
    • Informative Informative x 1
  4. rayvonn

    rayvonn SC Veteran

    Jan 19, 2015
    Significantly faster is my guess, at least in practical terms. That's based on a noticeable difference observed by me between f1.4 and f1.8 on the "tiny" m43 sensor. Even more of a difference on a FF sensor then.
    • Appreciate Appreciate x 1
  5. porchard

    porchard SC Veteran

    Feb 24, 2013
    Devon, UK
    The difference is 1.68 stops (by calculation).
    • Winner Winner x 1
    • Informative Informative x 1