The 21/3.5 I have also has very bad edge resolution at
f3.5 close up. I doesn't have that problem at infinity
and at f8 it follows Gary's test closely in that it's
tack sharp.
I have gotten very good closeup results with this
lens, however, since the blurriness is not noticeable
to about 500ff center and anthing in the center is
sharp so it highlights things in the center while a
flat field macro keep everything sharp. Also stopping
the lens down to f11-16 improves edge performance
dramatically to the point of being virtually
unnoticable at 4x6.
The 21/3.5 is a great lens I've found out, it's tiny
very sharp at infinity and makes very good pictures
closeup if you are willing to work around it's
limitations in that area.
Mark Lloyd
--- "C.H.Ling" <chling@xxxxxxxxxxxxx> wrote:
> Okay everybody, here below is my quick observation
> on the viewfinder with my
> OM4 (the OM1/2's finder is a little poorer in edge
> resolution) and Zuiko
> lenses wide open.
>
> 21/3.5 at closest focusing distance of 0.2m, mag.
> around 1:6, it gave very
> poor edge resolution, could be similar to the Map
> result Jochen posted. At
> 1:15 it is still not good but improved a lot, I bet
> it would be fine at 1:40
> as Gary's result was not bad at F5.6 ("B" grade).
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