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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