Hi Konrad:
> I'm interested in your
> statement that zooms that change focus on zooming are not real zooms.
> Why does that occur?
It is called a varifocal design. That is a cheaper and more simple way of
designing a zoom lens. It theoretically offers better performance due to less
design compromises. It really works well with autofocus since you never see
the focus shift. However, the design predates zoom lenses that hold their
focus.
Gary Reese
Las Vegas, NV
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