Was this test done on the *istD? If so that might explain why you didn't see
the soft corners.
Nick
-----Original Message-----
From: "jtainter"<[EMAIL PROTECTED]>
I ordered this lens recently after seeing some positive comments on
dpreview, backed up by a link to images, including one showing very good
sharpness at f2.8. After ordering it I saw some comments here indicating that
it is soft in the corners at f2.8. This was followed by Will Robb commenting
that it is probably as good in the corners as anyone else's 20 mm. I would use
this at f2.8 a lot. So I was concerned whether I should send it back.
I have access to a Sigma EX DG 20 f1.8, which I have been carrying when I
travel. This weekend I tested both 20s against a mud brick wall (lots of
detail) at several apertures, including f2.8. Today I processed the f2.8 images
and looked at them onscreen at 100% (actual pixels) enlargement.
At f2.8 the Pentax lens blows away the Sigma. It is noticeably sharper in
the center, at the edges, and at the corners. And this is with the Pentax lens
wide open while the Sigma is stopped down 1.3 stops. The FA 20 is a keeper and
goes into my kit. The Sigma goes back to where I borrowed it.
