Re: Q about vivitar focusing macro 2x teleconverter 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
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