The field curvature of 21/3.5 is very high at close distance, you will see
very soft corners when center is in focus. The 21/2 is much better, produce
sharp image from edge is edge (of course the corner may not be as sharp as
the center but much better than the case of 21/3.5) . Also, in my experience
all my lenses with close focus correction provide better resolution than the
one without at close distance (even at the center).
C.H.Ling
----- Original Message -----
From: "iwert" <zuiko@xxxxx>
> Hello,
>
> Reading through documentation on the wide angles I often see the words
> "close focus abberations". I have a zuiko 21f3.5 and zuiko 21f2 (close to
> mint @ 351$!), of which the latter has a special mechanism correcting for
> "close focus abberations". Which difference should I see when clos
focussing
> with these two lenses?
>
> Anybody who can enligthen me on this?
>
> Iwert.
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