I just returned from a camping trip next to a lake and took some birding photos. Some of them were a bit OOF and I decided to see what Sharpen could do. On the most part I was amazed at how well the 3 modes did with some of the photos, but then I came across this:
Here is part of an image I caught. You can see only the part including the head because that is what I wanted to sharpen. This is the image in Sharpen after adjustment but before saving it. For what it is worth the image looks a lot better than the reduced version shows.
However here is the image after save:
I have no idea where all of that distortion came from, but I tried it using both Focus and Sharpen and both show the exact same artifact. It can not be because there is too much adjustment as I only used 30% strength and 20% noise reduction.
I have been more and more impressed with Sharpen as I worked through my images, but this was a big disappointment.