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Thread: DOF with 35mm and 56mm with the same field of view

  1. #1

    DOF with 35mm and 56mm with the same field of view

    I think about buying a FFL Lens and think about what will give me a smaller DOF with the same aperture and the same field of view.
    1. 35mm, F2, FOV=AxB, Distance=1m
    To take a portrait picture of people I have to stay at a distance let us say 1m.

    2. 56mm, F2, FOV=AxB, Distance=1m+X
    To take the same picture with the same field of view I have to go further afar. Don't know where but it is further afar as 1m.

    1m is only an example. It should be the same with any distance.
    I know when I'm close to the object the DOF is smaller. But this is only valid when I have the same focal length. So in this fact I change the focal length and the distance to the object to have the same field of view. What will give me a smaller DOF? The 35mm or the 56mm?

    Please help.

    I didn't find the right solution from the Internet.

    References https://www.dpreview.com/forums/post/57432766

    business app trailer

  2. Last edited by JensenBreck; 24-10-2017 at 02:15 PM.

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