wide ap focus
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  1. #1
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    Default wide ap focus

    I cannot get over how amazing everyone's pics look when using your lens at the widest ap (1.4 or 1.8 depending on what you all have). I have the 35mm 1.8 and I guess I'm just not used to knowing where exactly to stand. in relation to the subject (I know there's the dof website I need to go look at it again and figure out what depth is of I want to see (usually face) and how far I need to stand in order to get both friggin eyes in focus

    argh

    ok thanks for reading my small vent
    LJ
    ds1 Evan ds2 Adam

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    Posting Addict AmberBella's Avatar
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    In order to get both eyes in focus with such a wide aperture, both eyes need to be in the same field.
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  3. #3
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    just to clarify when you say same field what exactly do you mean. I've got pics of Evan where it appears he's looking at me straight on and one eye is awesome focus and the other isn't. I thought that was b/c the depth was too narrow b/c maybe I was too close and he was just slightly tilted

    Some of the pics I've seen recently the whole head appears in focus and anything just behind it is awesome bokeh

    sorry if this is dumb question
    LJ
    ds1 Evan ds2 Adam

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    Posting Addict sweetalienchick's Avatar
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    not a dumb question at all I struggle with focus at 1.4-1.8 too.
    Mikael 2, Jeanette 4,







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    Super Poster Bumbo Babies's Avatar
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    Here's the Depth of Field calculator website that I've read before: http://www.dofmaster.com/dofjs.html. I've read it about a dozen times and each time it sinks in a little better but the best way is to really get a feel for it. I posted two pics of my son yesterday that I took at 1.4. I was about 4ft away from him in the first pic. When I plug my camera model into the calculator, 50mm, 1.4, 4ft away, it says that I have a depth of field of 0.11ft, or about 1-2 inches. That's not much considering he's got a big head that is more than 1-2 inches deep. If you look at the pictures I took, his eyes look sharp in the first one but that's only because I cheated and did a little extra sharpening on his OOF eye. You can see that his eyes are at an angle, or not in the same focal plane, so with a depth of field of only 1-2 inches, one was bound to be out of focus. Both of his eyes were in focus in the second pic because I was a little farther away (I actually cropped this pic a little tighter whereas the first one was a SOOC crop) at about 6 ft away, my depth of field was 4in, plus he was looking right at me so his eyes were in the same focal plane.

    Keep practicing and you'll get the hang of it in no time!
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    dof calculator is great... you will notice that the wider your ap and the further you are away the deeper the focal plane... in a nutshell anyway. I still would like to get a firmer grasp on the mathematics concept-- so that it becomes second nature... you will too. Check out that link Krissy posted.

  7. #7
    Melvin76
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    Good explanation Krissy.

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    Quote Originally Posted by Bumbo Babies View Post
    If you look at the pictures I took, his eyes look sharp in the first one but that's only because I cheated and did a little extra sharpening on his OOF eye. !
    ya you were one of the many who have recently posted wide ap amazing focus pictures If one of those eyes was oof then I'm amazed, I didn't realize sharpening could make it look like that. I have a pic that I like but was a bit ticked at the eyes, I didn't attempt anything b/c I didn't know it could be fixed, now I'm going to go back and edit it (did you just sharpen the eyes or do an eye pop?)

    also thanks for posting that link, thats the one I was going to go look for again this weekend. I think I have to learn to stand further back than I think I'd want as a final pic b/c I can crop, its a hard rule to remember for me
    LJ
    ds1 Evan ds2 Adam

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