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How does one compute equivalent aperture?

Discussion in 'The Watering Hole' started by Jock Elliott, Jun 13, 2014.

  1. Jock Elliott

    Jock Elliott SC All-Pro

    Jan 3, 2012
    Troy, NY
    Is it f/stop times crop factor?

    Cheers, Jock
     
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  2. Boid

    Boid SC All-Pro

    Dec 15, 2011
    Bangalore, India
    Rajiv
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  3. Jock Elliott

    Jock Elliott SC All-Pro

    Jan 3, 2012
    Troy, NY
  4. Chris2500dk

    Chris2500dk SC Top Veteran

    598
    Dec 22, 2011
    Copenhagen, Denmark
    The really quick and dirty version is to multiply the lens aperture with the crop factor to get the f stop in fullframe equivalent.

    For example Sony RX100, f1.8-4.9 crop factor 2.7 = f4.9-13 FF equivalent

    It does get a bit messy with sensors not in the 3:2 form factor, but for a rough comparison it's certainly accurate enough, it's not like you can tell a huge difference between f10.5 and f11.5 DoF anyway.