that probably isn't CA. a contrasty edge where one side is overexposed will
cause blooming, which is pure purple and has no matching red fringe. the
only way to avoid that is to reduce exposure. the blooming is caused by
saturating the sensor interacting with the demosaicing algorithm in the
camera or converter.
Herb....
----- Original Message -----
From: "Joseph Tainter" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Tuesday, July 05, 2005 1:38 PM
Subject: Re: F 70-210mm 4.0-5.6
Sorry to say, I have just seen my first chromatic aberration from this
lens. In Prague a couple of weeks ago, I photographed some gargoyles on a
cathedral. The scene was an individual gargoyle, shot at 210 mm. and f5.6
(wide open). In the background are some gothic architectural elements that
are rendered out of focus, set against a lighter sky. There is a purple
halo around the OOF architectural elements. Since the CA is in the center
of the image area, ACR cannot fix it. Although shot wide open, the
gargoyle I was focusing on came out pleasingly sharp.
