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Thread: How to read old american f/stops.....

  1. #1

    Join Date
    Oct 2007
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    50

    How to read old american f/stops.....

    Hi, could somebody please explain me how to translate the following f/stops written on the barrel of an old american Petzval:

    1 2 4 8 16 22

    Thank's a lot in advance

    Torsten

  2. #2
    Drew Saunders drew.saunders's Avatar
    Join Date
    Dec 2006
    Location
    Palo Alto, CA
    Posts
    538

    Re: How to read old american f/stops.....

    Here's the answer from 1899:

    http://en.wikipedia.org/wiki/F_stop#...bering_systems

    Easier: 16 = 16 and work your way back/forward from that.

  3. #3
    Eric Biggerstaff
    Join Date
    Apr 2005
    Location
    Denver, Colorado
    Posts
    1,135

    Re: How to read old american f/stops.....

    US f/stop
    1 = f4
    2 = f5.6
    4 = f8
    8 = f11
    16 = f16
    32 = f22
    64 = f32
    128 = f45
    256 = f64
    Eric Biggerstaff

    www.ericbiggerstaff.com

  4. #4

    Join Date
    Oct 2007
    Posts
    50

    Re: How to read old american f/stops.....

    thank's a lot!!

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