2. When do you use sharp/unsharp filters in the PS or
other software? (any hints on how to judge a reasonable level?)
Keep in mind your target. Sharpening for the web is different than
sharpening for a printer, for example. I believe some of the
sharpening plug-ins available keep this in mind.
Also, if you start to see halos, you've gone too far.
IMHO, the image is too sharp... you've created some moire in the
building windows. Frankly, it looks like it could benefit from an
(auto)levels more than anything- makes the haze go away.
-Ryan
