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Thread: Front Axis tilt with back base tilt

  1. #11
    Tin Can's Avatar
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    Re: Front Axis tilt with back base tilt

    There are studio cameras with axis and bottom tilt

    I am familiar with Horseman 8X10 LX and don't confuse it with their L

    Horseman by TIN CAN COLLEGE, on Flickr
    Images vastly preferred

    not game trying to


    focus


    In Time

  2. #12
    Alan Klein's Avatar
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    Re: Front Axis tilt with back base tilt

    Quote Originally Posted by Fatih View Post
    Yes, front standard is axial, back standard is basal tilt.
    I'm not sure if that's asymmetrical. Maybe someone else knows?

  3. #13

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    Re: Front Axis tilt with back base tilt

    Tilting or swinging the camera back changes the image. It changes the relative sizes of objects in relation to each other, with objects on the part of the ground glass/film farther from the lens getting larger and vice-versa. It also controls where the plane of sharp focus is in the scene your a photographing, so it's a kind of double-duty movement.

    Tilting or swinging the front does not change the image; it just controls where the plane of sharp focus is in the scene being photographed.

    Note that setting up your camera entails a choice of how to position the camera back relative to the subject. Often, we set up with the camera leveled, but that doesn't have to be the case. At any rate, if we want parallel vertical lines in the scene (think tall buildings or trees) not to converge, then the back has to be positioned parallel to them. Or, conversely, if we want to make the lines converge more, or make something "loom" or make the foreground relatively larger, then back position will determine that.

    So, positioning the back relative to the subject entails a choice about how we want the subject to be rendered (conscious or not...).

    Using back tilt or swing to reposition the plane of sharp focus will change the image. Many times this is desirable, sometimes not. Very slight movements make only very slight changes to the image. However, if we've positioned the camera back carefully for a particular reason (say an architectural shot where we want parallel vertical lines to be rendered parallel on the film), then any repositioning of the plane of sharp focus needs to be done using front movements.

    I can envision a situation where back tilt is used to get a desired rendering of the image and then front tilt or swing is used to get the plane of sharp focus in its optimum position.

    That said, lots of shots don't need an exact positioning of the camera back, so using back tilt, especially in small amounts, doesn't change the image enough to make a substantial difference. Many landscape photographers routinely use back tilt because it's easy to apply and the like the slight exaggeration of the foreground achieved that way.

    Others like to use axis tilts when possible, since they usually require fewer iterations of refocusing and refining the tilt; you can just tilt till the near and far focus points are both in sharp focus and go. So with cameras that only have base tilts on the back, but axis tilts on the front, the front tilt gets used more just for that reason.

    Another reason to go with back tilt rather than front is lens coverage. Tilting the front points the lens away from the center of the ground glass/film. If your lens has a smaller image circle and you use too much tilt, you end up vignetting the image. Using back tilt keeps the center of the film on the lens axis.

    FWIW, axis tilts are those where the tilt movement revolves around a center line on the ground glass or middle of the lens. Base tilts revolve around an axis below the ground glass or lens center. Asymmetrical tilts are like axis tilts, but with the axis off center on the ground glass. They are used on rear standards primarily; I don't know of a camera with asymmetrical tilts on the front standard.

    Best,

    Doremus

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