Q about vivitar focusing macro 2x teleconverter

Discussion in '35mm Cameras' started by mike nelson, Sep 2, 2006.

  1. mike nelson

    mike nelson Guest

    Does anyone know the range of extension of the (now old) Vivitar macro
    focusing 2x teleconverter?

    That's the teleconverter with the built-in variable extension tube--the
    focusing ring has the notation 50mm at one extreme, but all the other
    numbers are magnification ratios. The range of travel from one extreme to
    the other is about .75 inch.

    Also, does anyone know which focal length macro lens it was originally
    designed for use with?


    thanks

    Mike
     
    mike nelson, Sep 2, 2006
    #1
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  2. mike nelson

    JD Guest

    The instruction sheet does not specify range of extension. It goes
    through the formulas for 50mm, for which the converter is marked. I
    suppose it was aimed for the 50mm lens because that's where you'll get
    1:1 macro and also the 50mm was the "standard" lens that came with most
    35mm cameras.

    The instructions do state it is desgined to work with a variety of high
    quality lenses. It mentions 28mm-400mm plus zoom lenses. The chart
    with the instructions show magnification and distances for a Canon 50mm,
    a Vivitar 55mm, a Vivitar 28-90, Vivitar 135mm and a Vivitar 70-210.

    When used on a zoom at any extension beyond the minimum (marked as
    infinity symbol), you will lose the zoom's capability of staying in
    focus though the zoom's range. That occurs with any extension tube.
    This was not a big deal with the Viviar 28-90 lens since that's a
    varifocal design and you were re-focusing when ever you changed focal
    length.

    It is a 7 element device.

    JD
     
    JD, Sep 4, 2006
    #2
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