I also just got a 21/3.5 from ebay, I don't think it is normal even it
has no close focus correction. Can you tell me what is the map size so
that I can duplicate the same test? I once bought a used 35-105 AF
from a shop, the front element has installed in the reverse way,
fortunately I found it out myself and do the correction to save some
repair cost. It had the same problem with center looks sharp and
corner very poor. Your case may be different, but it is possible that
someone do cleaning/repair job and reverse one or two elements during
put them back. Of course some element are very distint, you can't
reverse them.
BTW, although my 21/3.5 from ebay was in Excellent plus condition but
there was a big parcticle inside and a very thin oil layer on an inner
rear element, I have to disassembly the lens to clean it. I found the
third element group from the rear can be installed in reverse
direction.
C.H.Ling
Jochen Schiffler wrote:
>
> Hi, you're crazy! When should I ever read the 347 (and counting) mails????
>
> Just a short Question:
> Last week I received the Zuiko 21mm 3.5 from the bay. I did a couple test
> shots and today I had some time to scan and examine a few of them. I was
> shocked when I noticed the terrible edge sharpness at f3.5. Then calmed down
> because it's at (too) short distance and I guess I did a really bad job
> focussing. What do you think? Is it my fault? The other photographs seem ok.
>
> Here are three shots at close focussing distance...
> I adjusted exposure time roughly (with OM-1, light was changing rapidly)
>
> f3.5: http://www.schiffler.net/stuff/zuiko21_3.jpg
>
> f8: http://www.schiffler.net/stuff/zuiko21_8.jpg
>
> f16: http://www.schiffler.net/stuff/zuiko21_16.jpg
>
> ...and here some shots at various distances (can't remember the f stops)
> http://www.schiffler.net/stuff/farn.jpg
> http://www.schiffler.net/stuff/korn1.jpg
> http://www.schiffler.net/stuff/korn3.jpg
> http://www.schiffler.net/stuff/vine.jpg
>
> Jochen
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