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Lens angle of view

Discussion in 'Open Discussion' started by Kilauea, Apr 25, 2013.

  1. Kilauea

    Kilauea Mu-43 Regular

    110
    Jun 9, 2012
    Canada
    Nicolas
    I'm not sure if its expressing myself properly, but I'm looking for some information regarding lenses and angle of view.

    Basically, let's say I have a 12mm, what will be the angle of view? I think it will be close to 90 degrees, but not sure.

    The same applies for 14mm, 25mm, 45mm and 75mm.
     
  2. DeeJayK

    DeeJayK Mu-43 Hall of Famer

    Feb 8, 2011
    Pacific Northwest, USA
    Keith
    Here's a calculator that should give you what you are looking for (just be sure you select "Four Thirds" in the format selector at the bottom):

    Lens Angle Calculator
     
  3. elavon

    elavon Mu-43 All-Pro

    Sep 1, 2012
    Tel Aviv Israel
    Ehud
    And here is a picture that put it into visual representation.

    oly-fov3-1.
     
  4. phigmov

    phigmov Mu-43 Hall of Famer

    Apr 4, 2010
  5. arad85

    arad85 Mu-43 Veteran

    477
    Aug 16, 2012
    Just be careful with angle/field of view simulators - the field of view a particular lens length will give is solely defined by the sensor size. A 12mm lens on a :43: camera will give a different field of view to a 12mm lens on a full frame.
     
  6. Kilauea

    Kilauea Mu-43 Regular

    110
    Jun 9, 2012
    Canada
    Nicolas
    Thanks, that is what I was asking for. The actual crop factor is 2.08x and not 2x ?
     
  7. arad85

    arad85 Mu-43 Veteran

    477
    Aug 16, 2012
    It depends how you measure it - the sensor aspect ratios are different, so you will get different FoV multipliers depending on whether you measure width, height or diagonal. Traditionally, it is diagonal that is used, but if you want the exact conversion factors they are:

    landscape: 17.3 : 36 = 2.081
    portrait: 13 : ~24 = 1.846
    diagonal: 21.6 : ~43.5 = 2.014

    Take your pick :wink:
     
  8. dwig

    dwig Mu-43 Top Veteran

    622
    Jun 26, 2010
    Key West FL
    True

    Basically, the crop factor for the diagonal ignores that the two formats have different aspect ratios. The crop factor derived from the shorter dimensions is appropriate when comparing m43 full image to a 35mmFF cropped to 5:4 aspect ratio. The crop factor derived from the longer pair of dimensions is appropriate when comparing m43 cropped to 3:2 to a 35mmFF uncropped.