Thanks for your tests, C.H.!
I do agree with your opinions and I'm glad to see that the Tamron doesn't
outperform (if not slightly IMHO for what concerns chromatic aberrations)
the Zuiko and is indeed perfectly comparable to it.
The Zuiko has almost half the lens elements of the Tamron and is not an "LD"
lens, so it turns out that Olympus engineers (if not Maitani itself) were
really smart when designing it. After all, when dealing with optical
systems, it's true that "less is better".
Ciao!
Fabio
On 3/23/06, C.H.Ling <chling@xxxxxxxxxxxxx> wrote:
>
>
> Ok, my favourite topic again, tests were done few days ago, the Tamron
> 180/2.5 is also included!
>
> http://www.accura.com.hk/180T/180T.htm
>
> Even the photos are without very bright reflections but still found quite
> serious chroma at large apertures.
>
> Photos were taken with E-300, OM180/2.8, Tamron 180/2.5, OM200/4 and
> DZ50-200 2.8-3.5. RAW mode, white balance and exposure adjustment done in
> Olympus Viewer to ensure similar brightness and color for comparison.
> Photos
> are good for bokeh and chroma comparison but missing the required details
> for resolution check.
>
> My personal observation for both characters are (the best comes first):
>
> Chroma: DZ50-200, OM200/4, Tamron 180, OM180
> Bokeh: OM200/4, OM180, DZ50-200, Tamron 180
>
> One more observation is the Tamron is much warmer than all other Zuikos
> tested and it is very heavy.
>
> C.H.Ling
>
> ----- Original Message -----
> From: "Fabio Fiorellato"
>
> >
> > Well, Moose, the CA showed up even in the center of the frame in film
> > shots
> > taken with my OM4-Ti and the above mentioned lens. It's not only just a
> > matter of corners.
> >
> > Of course CA control becomes critical in the image corners and current
> > lenses, though performing decently in the center of the frame, often
> show
> > problems at the far edges.
> >
> > It's just that the 180mm f/2.8 (at least my sample) do effectively show
> CA
> > on the full frame surface (unless I close the lens to f/8 or lower as
> C.H.
> > Ling noted).
> >
> > My two cents
> >
> > Fabio
> >
>
>
>
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