I think you are talking about the Tamron SP 2X F System, I have one. It has
very high resolution when combine with the 100/2, also works very well with
50/1.4, provide very sharp picture even wide open. But the field curvature
of this tele-converter is very high. You need to stop down for landscape,
but for portrait or other shoots where you don't need the whole field in
focus there will be no problem. I think the field curvature problem is not
so significant for a f3.5 lens.
I haven't compare it with the Zuiko 2XA, but the Zuiko 2XA provide excellent
result with the matched lens, didn't notice any field curvature problem yet
(I have tried135/2.8 and 200/4). On the other hand, the Tamron can be used
on most Zuikos.
C.H.Ling
----- Original Message -----
From: "mike blayney" <mikeblayney@xxxxxxxxx>
> I've just acquired a Tamron SP 2x teleconverter for 10UKP. Limited try out
with
> a 135mm f3.5. I wasn't expecting much but am fairly impressed with the
results
> although the contrast appears a bit low. Anyone else have experience with
this
> Tamrom? Which Zuiko lenses does it work well with? How does it compare to
the
> (rather expensive) Zuiko?
>
>
> =====
> Mike Blayney, Devon, UK.
>
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