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
On 3/21/06, Moose <olymoose@xxxxxxxxx> wrote:
>
> Fabio Fiorellato wrote:
> > Daniel, did you notice any blue or purple halo around light subjects in
> your
> > full size shots? Judging from these reduced images everything seems OK,
> > indeed...
> >
> > I wonder why that (in)famous "cromatic aberration problem" the 180 f/2.8
> is
> > so renowed for has not shown up this time... :)
> Remember that the 4/3 format only uses the central portion of the image
> circle from 35mm format lenses. So although it will enlarge any
> abberations in the center, it won't show any outside there at all.
>
> At the size of the posted images, it's pretty unlikely to be able to see
> CA, anyway.
>
> Moose
>
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