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Re: [OM] new Zuikos desired

Subject: Re: [OM] new Zuikos desired
From: "Marco" <tom@xxxxxxxxxxxx>
Date: 18 Oct 98 22:24:48 +0200
On Mer, 16 set 1998 17:25, PCACala@xxxxxxx <mailto:PCACala@xxxxxxx> wrote: 
>Wide open at f/2, the faster Zuiko really stinks.  Vignetting is terrible,
>edge sharpness and contrast is nonexistent, but center sharpness and
>contrast
>nudge out the 2.8 at f/2.8
>
>Wide open at f/2.8, the slower Zuiko has unacceptable (to me) edge
>sharpness
>with fair contrast, although not as bad as the f/2, but less pronounced
>vignetting.
>
>At f/8, the faster Zuiko edges out the slower in center contrast and
>resolution and is obviously better in the corners.  A fine performer!
>Vignetting is gone, as was expected.
>
>At f/16, I was surprised to see that the faster Zuiko held it's own, vs.
>published tests.  The edge performance was splitting hairs, so I won't
call
>it.  Center was a bit better for the faster Zuiko.
>

Looks like it has some curvature of field... if so, it should be possible
to get better results on borders by focusing on border zone instead of
center.

I understand you did your test for 20 focal lenghts, maybe at infinity it
works better? 

Marco



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