David is quite correct in his observations IMO. This problem with
chromatic aberation in the 180/2.8 has been observed and mentioned by
various people on this list, numerous times.
It is most often mentioned in relation to point source lights like stars
and street lights.
Here is a segment from a post by Jeff Horner some time back:
--------------------
From: goonies@xxxxxxx
Date sent: Sun, 23 Mar 1997 22:07:12 -0700
To: olympus@xxxxxxxxxxx
Subject: Re: OLYMPUS: Re: 180 2.8
<snip>
I have owned both lenses (180mmf/2 and 180mmf/2.8). The f/2 was truly
phenomenal and the f/2.8 was very sharp and contrasty but had this strange
purple fringing/flare around backlit or highlight areas (probably pretty
noticeable on stars against a black background---maybe the cause of the
"dog" reputation with astrophotographers). It was very subtle but it was
there and kinda annoying. I checked this on a friend's Zuiko 180mmf/2.8
and it was there also. Other than that it was a fine lens. In comparison
to the Nikkor 180mmf/2.8 (I shot with the manual focus AIS version for 6
years) I found the two lenses very comprable---except for that purple
fringing on the Zuiko. The Zuiko 180mmf/2 blew both the f/2.8's away. Of
course, so did the price.
Jeff Horner
------------------
Giles
David Irisarri Vila wrote:
> I hope this little test, could help you to understand
> that this lens has serious problems with chromatic
> aberration.
> Best regards,
>
> Dave
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