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Thread: Tilt on the Alpa Max

  1. #1
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    Tilt on the Alpa Max

    I'm thrown off by something very basic here (perhaps the lack of
    sleep!).

    My Imaging train on the front end looks like this (read down)

    SK 120mm lens
    Alpa T Adapter
    Extension 006
    Extension 011
    +
    ALPA Max
    +
    Hasselblad Adapter (Shimmed correctly)
    +
    Phase One IQ250

    I did a simple test.
    Kept a book about 8 paces away from camera.
    Kept another book on a table about 24 paces away.
    Goal is to get book at 8 paces and 24 paces sharp.

    At f11 and f8, focused on near book at 8 paces away (1/3 of dist).
    Then started to tilt down so the book at 24 paces would also focus.
    No Go.

    Momentarily confused. What am I doing wrong?

    - aLV

  2. #2
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    Re: Tilt on the Alpa Max

    I believe you should focus back a little bit to get the tilted focal plane on both books. Thanks to the LiveView on the IQ250 it is easy.

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    Re: Tilt on the Alpa Max

    Did u mean defocus from the first book until the 2nd book
    comes into focus??

    Brain fried. Will try tmoro.

    TY!

    - aLV

  4. #4
    Senior Member dchew's Avatar
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    Re: Tilt on the Alpa Max

    Depending on the height of the books, you will probably want to focus much farther away than the front book. Maybe even beyond the second book. Once you begin tilting, infinity focus puts the focus plane horizontal. The amount of tilt brings that horizontal plane of focus closer to the camera (raises it up). So if the two books are at the same height, you would want to focus at infinity, then tilt until both books are in focus. As you bring in the focus from infinity, you are essentially tilting the plane of focus. If the second book is only a few feet higher than the first, your focus should be very close to infinity.

    8 paces will be about 6m, 24 about 18m. Your table is probably 1m high. Assuming the first book is on the ground, that's a 1/12 pitch; pretty low angle. I bet your focus distance should be much closer to infinity.

    Dave
    How glorious a greeting the sun gives the mountains! - John Muir

    davechewphotography.com
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    Re: Tilt on the Alpa Max

    Maybe this guide will be of some help: Using Tilt-Shift Lenses to Control Depth of Field

    Actually things become very easy if you have some understanding of the Scheimpflug principle and some practice with LiveView on a CMOS sensor. Enjoy how the technology evolves!

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    Re: Tilt on the Alpa Max

    I've shot with canon/nikon t/s before and understand sch+hinge stuff.
    Perhaps, its the order of adapters on the alpa.

    aLV
    Al Vinjamur Photography

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    Re: Tilt on the Alpa Max

    Yup!

    I had forgotten to put one of the required Alpa adapters.

    I'm going to just color mark things and that way it'll be
    idiot proof! LOL.

    For the 90mm and 120mm SK, I needed to use the Tilt and
    a 6mm and 11mm adapter (34mm total length).

    For the Rodie 40mm and 70mm, I needed to use the fixed
    34mm adapter.

    Everything works beautiful. Since this was the first time I played
    with the Alpa tilt adapter, focusing on foreground and tilting for
    background is a lot finer as a process. Just a question of muscle
    memory building, I guess.

    -aLV

  8. #8
    Senior Member dchew's Avatar
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    Re: Tilt on the Alpa Max

    Good to hear.

    I think you mean the fixed 17mm adapters for the 40mm and 70mm. Those are 17sb's, not 34sb.

    That is interesting that you find it easier to focus on the foreground then tilt for the background. Regardless of how you approach it, the one thing I find important is to come at the focus point knowing which side you are on. Almost like the old "offset technique" in orienteering. If you purposely go to one side or the other, then you know which way you have to turn to get to your destination. Nothing more frustrating than going back and forth not finding anything sharp!

    Ciao,
    Dave
    How glorious a greeting the sun gives the mountains! - John Muir

    davechewphotography.com

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    Re: Tilt on the Alpa Max

    never can distinguish t17mm and t34mm.
    Leica MP, M7, ZM21/4.5, Leica 35/1.4, 75/2

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