P3D Re: Matched Zoom Lenses

[George Themelis <gthemelis@xxxxxxxxx>]

> Is there a reason why two zoom lenses made by the
> same mfgr. ( 70-210)
> would be less likely to match at either end VS a
> pair of fixed lenses by
> the same mfgr? 

Without knowing the exact details, I have a feeling that fixed lenses
are produced to tighter specifications for focal length.  Zoom lenses
have more elements and an extra degree of freedom (zoom) which I
imagine complicates things.  The question is, once two zoom lenses are
matched for some FL (say the 35-70mm lenses are matched at 50 mm) and
linked together, does that mean that they will be matched at the ends
too?  I think Larry Haines reported that his X3's 28-70mm zooms are off
at the wide angle end, while they are OK at the longer end.

George Themelis
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